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4x+18=x+99
We move all terms to the left:
4x+18-(x+99)=0
We get rid of parentheses
4x-x-99+18=0
We add all the numbers together, and all the variables
3x-81=0
We move all terms containing x to the left, all other terms to the right
3x=81
x=81/3
x=27
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