X+21=-2x+21

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Solution for X+21=-2x+21 equation: 



X+21=-2X+21

We move all terms to the left:

X+21-(-2X+21)=0

We get rid of parentheses

X+2X-21+21=0

We add all the numbers together, and all the variables

3X=0

X=0/3

X=0

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