-2x+21=-6x+3+6

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Solution for -2x+21=-6x+3+6 equation: 



-2x+21=-6x+3+6

We move all terms to the left:

-2x+21-(-6x+3+6)=0

We add all the numbers together, and all the variables

-2x-(-6x+9)+21=0

We get rid of parentheses

-2x+6x-9+21=0

We add all the numbers together, and all the variables

4x+12=0

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

4x=-12

x=-12/4

x=-3

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