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90x=80-x
We move all terms to the left:
90x-(80-x)=0
We add all the numbers together, and all the variables
90x-(-1x+80)=0
We get rid of parentheses
90x+1x-80=0
We add all the numbers together, and all the variables
91x-80=0
We move all terms containing x to the left, all other terms to the right
91x=80
x=80/91
x=80/91
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