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-2x=5x+84
We move all terms to the left:
-2x-(5x+84)=0
We get rid of parentheses
-2x-5x-84=0
We add all the numbers together, and all the variables
-7x-84=0
We move all terms containing x to the left, all other terms to the right
-7x=84
x=84/-7
x=-12
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