-2x=21-12x

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Solution for -2x=21-12x equation: 



-2x=21-12x

We move all terms to the left:

-2x-(21-12x)=0

We add all the numbers together, and all the variables

-2x-(-12x+21)=0

We get rid of parentheses

-2x+12x-21=0

We add all the numbers together, and all the variables

10x-21=0

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

10x=21

x=21/10

x=2+1/10

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