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680=2(2x+40)+2x
We move all terms to the left:
680-(2(2x+40)+2x)=0
We calculate terms in parentheses: -(2(2x+40)+2x), so:We get rid of parentheses
2(2x+40)+2x
We add all the numbers together, and all the variables
2x+2(2x+40)
We multiply parentheses
2x+4x+80
We add all the numbers together, and all the variables
6x+80
Back to the equation:
-(6x+80)
-6x-80+680=0
We add all the numbers together, and all the variables
-6x+600=0
We move all terms containing x to the left, all other terms to the right
-6x=-600
x=-600/-6
x=+100
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