X=84-2y

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Solution for X=84-2y equation: 



X=84-2X

We move all terms to the left:

X-(84-2X)=0

We add all the numbers together, and all the variables

X-(-2X+84)=0

We get rid of parentheses

X+2X-84=0

We add all the numbers together, and all the variables

3X-84=0

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

3X=84

X=84/3

X=28

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