X=30+3y

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Solution for X=30+3y equation: 



X=30+3X

We move all terms to the left:

X-(30+3X)=0

We add all the numbers together, and all the variables

X-(3X+30)=0

We get rid of parentheses

X-3X-30=0

We add all the numbers together, and all the variables

-2X-30=0

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

-2X=30

X=30/-2

X=-15

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