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9x-12=54+2x
We move all terms to the left:
9x-12-(54+2x)=0
We add all the numbers together, and all the variables
9x-(2x+54)-12=0
We get rid of parentheses
9x-2x-54-12=0
We add all the numbers together, and all the variables
7x-66=0
We move all terms containing x to the left, all other terms to the right
7x=66
x=66/7
x=9+3/7
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