1. To solve the equation a, we can start by simplifying the expression on the left side:

720:(41-(2x-5)) = 2^3.5

First, let's simplify the expression inside the parentheses:

41 - (2x - 5) = 41 - 2x + 5 = 46 - 2x

Now, let's substitute this expression back into the equation:

720:(46 - 2x) = 2^3.5

To simplify the left side, we can divide 720 by (46 - 2x):

720 / (46 - 2x) = 2^3.5

Now, let's solve for x. We can start by simplifying the right side:

2^3.5 = 2^(7/2) = sqrt(2^7) = sqrt(128) = 8

Now, we have the equation:

720 / (46 - 2x) = 8

To solve for x, we can multiply both sides of the equation by (46 - 2x):

720 = 8(46 - 2x)

720 = 368 - 16x

16x = 368 - 720

16x = -352

x = -352/16

x = -22

Therefore, the solution to equation a is x = -22.

2. To solve the equation b, we can start by simplifying the expression on the left side:

6(x + 11) - (14 - 7x) = 26

First, let's distribute the 6 to the terms inside the parentheses:

6x + 66 - (14 - 7x) = 26

Now, let's simplify the expression inside the parentheses:

6x + 66 - 14 + 7x = 26

Combine like terms:

13x + 52 = 26

Subtract 52 from both sides:

13x = -26

Divide both sides by 13:

x = -26/13

x = -2

Therefore, the solution to equation b is x = -2.

3. To solve the equation c, we can start by simplifying the expression on the left side:

x - 5/100 + x - 4/101 + x - 3/102 = x - 100/5 + x - 101/4 + x - 102/3

First, let's find a common denominator for the fractions on both sides. The common denominator will be the least common multiple of 100, 101, and 102, which is 10,202.

Now, let's rewrite the equation with the common denominator:

(10202x - 101 + 100x - 101 + 99x - 102) / 10202 = (2040x - 1010 + 2550x - 1010 + 3400x - 1020) / 10202

Combine like terms on both sides:

(10202x - 302) / 10202 = (7990x - 3040) / 10202

Now, let's cross multiply:

10202(7990x - 3040) = 10202(10202x - 302)

Simplify both sides:

7990x - 3040 = 10202x - 302

Subtract 7990x from both sides:

-4950 = 2212x - 302

Add 302 to both sides:

-4628 = 2212x

Divide both sides by 2212:

x = -4628/2212

Simplify the fraction:

x = -2314/1106

x = -2

Therefore, the solution to equation c is x = -2.