3x+21=-3x+9

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Solution for 3x+21=-3x+9 equation: 



3x+21=-3x+9

We move all terms to the left:

3x+21-(-3x+9)=0

We get rid of parentheses

3x+3x-9+21=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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