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180=91+7x
We move all terms to the left:
180-(91+7x)=0
We add all the numbers together, and all the variables
-(7x+91)+180=0
We get rid of parentheses
-7x-91+180=0
We add all the numbers together, and all the variables
-7x+89=0
We move all terms containing x to the left, all other terms to the right
-7x=-89
x=-89/-7
x=12+5/7
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