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(5x-12)=(4x+9)
We move all terms to the left:
(5x-12)-((4x+9))=0
We get rid of parentheses
5x-((4x+9))-12=0
We calculate terms in parentheses: -((4x+9)), so:We get rid of parentheses
(4x+9)
We get rid of parentheses
4x+9
Back to the equation:
-(4x+9)
5x-4x-9-12=0
We add all the numbers together, and all the variables
x-21=0
We move all terms containing x to the left, all other terms to the right
x=21
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