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9+x/12=-12
We move all terms to the left:
9+x/12-(-12)=0
We add all the numbers together, and all the variables
x/12+21=0
We multiply all the terms by the denominator
x+21*12=0
We add all the numbers together, and all the variables
x+252=0
We move all terms containing x to the left, all other terms to the right
x=-252
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