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7x(10+)=84
We move all terms to the left:
7x(10+)-(84)=0
We add all the numbers together, and all the variables
7x0-84=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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