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x/(-5)-12=8
We move all terms to the left:
x/(-5)-12-(8)=0
We add all the numbers together, and all the variables
x/(-5)-20=0
We multiply all the terms by the denominator
x-20*(-5)=0
We add all the numbers together, and all the variables
x+100=0
We move all terms containing x to the left, all other terms to the right
x=-100
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