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36=12x-8x
We move all terms to the left:
36-(12x-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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