-2x=21-5x

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Solution for -2x=21-5x equation: 



-2x=21-5x

We move all terms to the left:

-2x-(21-5x)=0

We add all the numbers together, and all the variables

-2x-(-5x+21)=0

We get rid of parentheses

-2x+5x-21=0

We add all the numbers together, and all the variables

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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