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80(x+12)=100
We move all terms to the left:
80(x+12)-(100)=0
We multiply parentheses
80x+960-100=0
We add all the numbers together, and all the variables
80x+860=0
We move all terms containing x to the left, all other terms to the right
80x=-860
x=-860/80
x=-10+3/4
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