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8(x+21)=2x+16
We move all terms to the left:
8(x+21)-(2x+16)=0
We multiply parentheses
8x-(2x+16)+168=0
We get rid of parentheses
8x-2x-16+168=0
We add all the numbers together, and all the variables
6x+152=0
We move all terms containing x to the left, all other terms to the right
6x=-152
x=-152/6
x=-25+1/3
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