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102x+(-84x)=36
We move all terms to the left:
102x+(-84x)-(36)=0
We get rid of parentheses
102x-84x-36=0
We add all the numbers together, and all the variables
18x-36=0
We move all terms containing x to the left, all other terms to the right
18x=36
x=36/18
x=2
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