10x - 12 + 10 = 18 - 20
10x - 2 = -2
10x = 0
x = 0
Answer:

Step-by-step explanation:
Given
Represent point A as thus;

Required
Determine the new position of A, when rotated counterclockwise
The new position will be denoted as A'
When a point is rotated counterclockwise, we start by switching the positions of x and y as follows:

Then, y is negated to give A'

I dont know if this is right but the answer to 2(12+8x)-3(4x-9) might be 4x+51?