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2x=(10x-21)
We move all terms to the left:
2x-((10x-21))=0
We calculate terms in parentheses: -((10x-21)), so:We get rid of parentheses
(10x-21)
We get rid of parentheses
10x-21
Back to the equation:
-(10x-21)
2x-10x+21=0
We add all the numbers together, and all the variables
-8x+21=0
We move all terms containing x to the left, all other terms to the right
-8x=-21
x=-21/-8
x=2+5/8
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