21=10x-7x

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Solution for 21=10x-7x equation:



21=10x-7x
We move all terms to the left:
21-(10x-7x)=0
We add all the numbers together, and all the variables
-(+3x)+21=0
We get rid of parentheses
-3x+21=0
We move all terms containing x to the left, all other terms to the right
-3x=-21
x=-21/-3
x=+7

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