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55x-3(9x=12)=-64
We move all terms to the left:
55x-3(9x-(12))=0
We multiply parentheses
55x-27x+36=0
We add all the numbers together, and all the variables
28x+36=0
We move all terms containing x to the left, all other terms to the right
28x=-36
x=-36/28
x=-1+2/7
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