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-36=4x-8x
We move all terms to the left:
-36-(4x-8x)=0
We add all the numbers together, and all the variables
-(-4x)-36=0
We get rid of parentheses
4x-36=0
We move all terms containing x to the left, all other terms to the right
4x=36
x=36/4
x=9
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