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(2x+13)-x=85
We move all terms to the left:
(2x+13)-x-(85)=0
We add all the numbers together, and all the variables
-1x+(2x+13)-85=0
We get rid of parentheses
-1x+2x+13-85=0
We add all the numbers together, and all the variables
x-72=0
We move all terms containing x to the left, all other terms to the right
x=72
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