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11x-189=2x-9
We move all terms to the left:
11x-189-(2x-9)=0
We get rid of parentheses
11x-2x+9-189=0
We add all the numbers together, and all the variables
9x-180=0
We move all terms containing x to the left, all other terms to the right
9x=180
x=180/9
x=20
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