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(2x-13)=(3x-21)
We move all terms to the left:
(2x-13)-((3x-21))=0
We get rid of parentheses
2x-((3x-21))-13=0
We calculate terms in parentheses: -((3x-21)), so:We get rid of parentheses
(3x-21)
We get rid of parentheses
3x-21
Back to the equation:
-(3x-21)
2x-3x+21-13=0
We add all the numbers together, and all the variables
-1x+8=0
We move all terms containing x to the left, all other terms to the right
-x=-8
x=-8/-1
x=+8
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