(21-2x)=(5x-7)

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Solution for (21-2x)=(5x-7) equation:



(21-2x)=(5x-7)
We move all terms to the left:
(21-2x)-((5x-7))=0
We add all the numbers together, and all the variables
(-2x+21)-((5x-7))=0
We get rid of parentheses
-2x-((5x-7))+21=0
We calculate terms in parentheses: -((5x-7)), so:
(5x-7)
We get rid of parentheses
5x-7
Back to the equation:
-(5x-7)
We get rid of parentheses
-2x-5x+7+21=0
We add all the numbers together, and all the variables
-7x+28=0
We move all terms containing x to the left, all other terms to the right
-7x=-28
x=-28/-7
x=+4

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