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3=-120x-84
We move all terms to the left:
3-(-120x-84)=0
We get rid of parentheses
120x+84+3=0
We add all the numbers together, and all the variables
120x+87=0
We move all terms containing x to the left, all other terms to the right
120x=-87
x=-87/120
x=-29/40
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