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135=115+7x
We move all terms to the left:
135-(115+7x)=0
We add all the numbers together, and all the variables
-(7x+115)+135=0
We get rid of parentheses
-7x-115+135=0
We add all the numbers together, and all the variables
-7x+20=0
We move all terms containing x to the left, all other terms to the right
-7x=-20
x=-20/-7
x=2+6/7
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