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10x=84-2x
We move all terms to the left:
10x-(84-2x)=0
We add all the numbers together, and all the variables
10x-(-2x+84)=0
We get rid of parentheses
10x+2x-84=0
We add all the numbers together, and all the variables
12x-84=0
We move all terms containing x to the left, all other terms to the right
12x=84
x=84/12
x=7
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