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x+2(2x+20)=84
We move all terms to the left:
x+2(2x+20)-(84)=0
We multiply parentheses
x+4x+40-84=0
We add all the numbers together, and all the variables
5x-44=0
We move all terms containing x to the left, all other terms to the right
5x=44
x=44/5
x=8+4/5
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