-7=-21+2x

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Solution for -7=-21+2x equation: 



-7=-21+2x

We move all terms to the left:

-7-(-21+2x)=0

We add all the numbers together, and all the variables

-(2x-21)-7=0

We get rid of parentheses

-2x+21-7=0

We add all the numbers together, and all the variables

-2x+14=0

We move all terms containing x to the left, all other terms to the right

-2x=-14

x=-14/-2

x=+7

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