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x+7x+(2x+40)=180
We move all terms to the left:
x+7x+(2x+40)-(180)=0
We add all the numbers together, and all the variables
8x+(2x+40)-180=0
We get rid of parentheses
8x+2x+40-180=0
We add all the numbers together, and all the variables
10x-140=0
We move all terms containing x to the left, all other terms to the right
10x=140
x=140/10
x=14
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