X=21-4yX=3y

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Solution for X=21-4yX=3y equation: 



X=21-4XX=3X

We move all terms to the left:

X-(21-4XX)=0

We add all the numbers together, and all the variables

X-(-4XX+21)=0

We get rid of parentheses

X+4XX-21=0

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

X+4XX=21

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