X=85-3y

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Solution for X=85-3y equation: 



X=85-3X

We move all terms to the left:

X-(85-3X)=0

We add all the numbers together, and all the variables

X-(-3X+85)=0

We get rid of parentheses

X+3X-85=0

We add all the numbers together, and all the variables

4X-85=0

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

4X=85

X=85/4

X=21+1/4

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