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8x+64=-3x+9
We move all terms to the left:
8x+64-(-3x+9)=0
We get rid of parentheses
8x+3x-9+64=0
We add all the numbers together, and all the variables
11x+55=0
We move all terms containing x to the left, all other terms to the right
11x=-55
x=-55/11
x=-5
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