-4x+9=21+2x

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Solution for -4x+9=21+2x equation: 



-4x+9=21+2x

We move all terms to the left:

-4x+9-(21+2x)=0

We add all the numbers together, and all the variables

-4x-(2x+21)+9=0

We get rid of parentheses

-4x-2x-21+9=0

We add all the numbers together, and all the variables

-6x-12=0

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

-6x=12

x=12/-6

x=-2

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