12=(7x-9) -(11-x)

12 = 7x - 9 - (11 - x)

To solve this equation, we can simplify it step by step:

Step 1: Distribute the negative sign inside the parentheses: 12 = 7x - 9 - 11 + x

Step 2: Combine like terms: 12 = 8x - 20

Step 3: Move the constant term to the other side of the equation: 12 + 20 = 8x

Step 4: Combine like terms: 32 = 8x

Step 5: Divide both sides by 8 to solve for x: 32/8 = x

Step 6: Simplify: x = 4

Therefore, the solution to the equation is x = 4.