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x/4-12=9
We move all terms to the left:
x/4-12-(9)=0
We add all the numbers together, and all the variables
x/4-21=0
We multiply all the terms by the denominator
x-21*4=0
We add all the numbers together, and all the variables
x-84=0
We move all terms containing x to the left, all other terms to the right
x=84
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