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99=3x+18
We move all terms to the left:
99-(3x+18)=0
We get rid of parentheses
-3x-18+99=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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