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-3x=-10x+84
We move all terms to the left:
-3x-(-10x+84)=0
We get rid of parentheses
-3x+10x-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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