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9x+64=x-40
We move all terms to the left:
9x+64-(x-40)=0
We get rid of parentheses
9x-x+40+64=0
We add all the numbers together, and all the variables
8x+104=0
We move all terms containing x to the left, all other terms to the right
8x=-104
x=-104/8
x=-13
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