X=21+-5y

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Solution for X=21+-5y equation: 



X=21+-5X

We move all terms to the left:

X-(21+-5X)=0

We add all the numbers together, and all the variables

X-(-5X)=0

We get rid of parentheses

X+5X=0

We add all the numbers together, and all the variables

6X=0

X=0/6

X=0

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