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3-x/12=87
We move all terms to the left:
3-x/12-(87)=0
We add all the numbers together, and all the variables
-x/12-84=0
We multiply all the terms by the denominator
-x-84*12=0
We add all the numbers together, and all the variables
-1x-1008=0
We move all terms containing x to the left, all other terms to the right
-x=1008
x=1008/-1
x=-1008
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