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18x-36=12x-84
We move all terms to the left:
18x-36-(12x-84)=0
We get rid of parentheses
18x-12x+84-36=0
We add all the numbers together, and all the variables
6x+48=0
We move all terms containing x to the left, all other terms to the right
6x=-48
x=-48/6
x=-8
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