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(9x)=(80-x)
We move all terms to the left:
(9x)-((80-x))=0
We add all the numbers together, and all the variables
9x-((-1x+80))=0
We calculate terms in parentheses: -((-1x+80)), so:We get rid of parentheses
(-1x+80)
We get rid of parentheses
-1x+80
Back to the equation:
-(-1x+80)
9x+1x-80=0
We add all the numbers together, and all the variables
10x-80=0
We move all terms containing x to the left, all other terms to the right
10x=80
x=80/10
x=8
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