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2(6+x)=84
We move all terms to the left:
2(6+x)-(84)=0
We add all the numbers together, and all the variables
2(x+6)-84=0
We multiply parentheses
2x+12-84=0
We add all the numbers together, and all the variables
2x-72=0
We move all terms containing x to the left, all other terms to the right
2x=72
x=72/2
x=36
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