x=-9,x=21

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Solution for x=-9,x=21 equation: 



x=-9.x=21

We move all terms to the left:

x-(-9.x)=0

We add all the numbers together, and all the variables

x-(-9x)=0

We get rid of parentheses

x+9x=0

We add all the numbers together, and all the variables

10x=0

x=0/10

x=0

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