a) [(4x + 28 * 3 + 55) : 5] = 35

First, simplify the expression inside the brackets:
(4x + 28 * 3 + 55) = (4x + 84 + 55) = (4x + 139)

Now, substitute this simplified expression back into the original equation:
[(4x + 139) : 5] = 35

To solve for x, multiply both sides of the equation by 5:
4x + 139 = 35 * 5
4x + 139 = 175

Subtract 139 from both sides of the equation:
4x = 175 - 139
4x = 36

Divide both sides of the equation by 4:
x = 36 / 4
x = 9

Therefore, the solution to the equation is x = 9.

b) (12x - 64) * 512 = 4 * 4096

First, simplify the expression on the left side of the equation:
(12x - 64) * 512 = 4 * 4096

Multiply both sides of the equation by 1/512 to isolate the term with x:
12x - 64 = (4 * 4096) / 512
12x - 64 = 32

Add 64 to both sides of the equation:
12x = 32 + 64
12x = 96

Divide both sides of the equation by 12:
x = 96 / 12
x = 8

Therefore, the solution to the equation is x = 8.

c) 720 : [41 - (2x - 5)] * 8 * 5

First, simplify the expression inside the square brackets:
41 - (2x - 5) = 41 - 2x + 5 = 46 - 2x

Now, substitute this simplified expression back into the original equation:
720 : (46 - 2x) * 8 * 5

Multiply the numbers outside the brackets:
720 : (46 - 2x) * 40

To solve for x, divide both sides of the equation by 40:
720 / 40 = 46 - 2x

Simplify the left side of the equation:
18 = 46 - 2x

Subtract 46 from both sides of the equation:
-28 = -2x

Divide both sides of the equation by -2:
x = -28 / -2
x = 14

Therefore, the solution to the equation is x = 14.