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9x=-3x+36
We move all terms to the left:
9x-(-3x+36)=0
We get rid of parentheses
9x+3x-36=0
We add all the numbers together, and all the variables
12x-36=0
We move all terms containing x to the left, all other terms to the right
12x=36
x=36/12
x=3
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