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88=13x+34+15
We move all terms to the left:
88-(13x+34+15)=0
We add all the numbers together, and all the variables
-(13x+49)+88=0
We get rid of parentheses
-13x-49+88=0
We add all the numbers together, and all the variables
-13x+39=0
We move all terms containing x to the left, all other terms to the right
-13x=-39
x=-39/-13
x=+3
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