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(13x-21)=(9x+35)
We move all terms to the left:
(13x-21)-((9x+35))=0
We get rid of parentheses
13x-((9x+35))-21=0
We calculate terms in parentheses: -((9x+35)), so:We get rid of parentheses
(9x+35)
We get rid of parentheses
9x+35
Back to the equation:
-(9x+35)
13x-9x-35-21=0
We add all the numbers together, and all the variables
4x-56=0
We move all terms containing x to the left, all other terms to the right
4x=56
x=56/4
x=14
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