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8x+99=5x+135
We move all terms to the left:
8x+99-(5x+135)=0
We get rid of parentheses
8x-5x-135+99=0
We add all the numbers together, and all the variables
3x-36=0
We move all terms containing x to the left, all other terms to the right
3x=36
x=36/3
x=12
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