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x+66=9x-54
We move all terms to the left:
x+66-(9x-54)=0
We get rid of parentheses
x-9x+54+66=0
We add all the numbers together, and all the variables
-8x+120=0
We move all terms containing x to the left, all other terms to the right
-8x=-120
x=-120/-8
x=+15
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