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9x-111=4x-11
We move all terms to the left:
9x-111-(4x-11)=0
We get rid of parentheses
9x-4x+11-111=0
We add all the numbers together, and all the variables
5x-100=0
We move all terms containing x to the left, all other terms to the right
5x=100
x=100/5
x=20
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