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8(2+x)=72
We move all terms to the left:
8(2+x)-(72)=0
We add all the numbers together, and all the variables
8(x+2)-72=0
We multiply parentheses
8x+16-72=0
We add all the numbers together, and all the variables
8x-56=0
We move all terms containing x to the left, all other terms to the right
8x=56
x=56/8
x=7
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