a) To solve this equation, we need to find the value of x. We can start by subtracting the remainder (85) from the right side of the equation:

323 - 85 = 238

Now we have the equation:

x : 105 = 238

To find the value of x, we can multiply both sides of the equation by 105:

x = 238 * 105

x = 25,090

Therefore, the value of x is 25,090.

b) To solve this equation, we need to find the value of x. We can start by subtracting the remainder (234) from the right side of the equation:

15126 - 234 = 14892

Now we have the equation:

14892 : x = 438

To find the value of x, we can multiply both sides of the equation by x:

14892 = 438 * x

To isolate x, we can divide both sides of the equation by 438:

x = 14892 / 438

x ≈ 34

Therefore, the value of x is approximately 34.