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988=104+13x-13
We move all terms to the left:
988-(104+13x-13)=0
We add all the numbers together, and all the variables
-(13x+91)+988=0
We get rid of parentheses
-13x-91+988=0
We add all the numbers together, and all the variables
-13x+897=0
We move all terms containing x to the left, all other terms to the right
-13x=-897
x=-897/-13
x=+69
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