6x+21=-3x-3

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



6x+21=-3x-3

We move all terms to the left:

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

We get rid of parentheses

6x+3x+3+21=0

We add all the numbers together, and all the variables

9x+24=0

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

9x=-24

x=-24/9

x=-2+2/3

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