X=77-2y

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Solution for X=77-2y equation: 



X=77-2X

We move all terms to the left:

X-(77-2X)=0

We add all the numbers together, and all the variables

X-(-2X+77)=0

We get rid of parentheses

X+2X-77=0

We add all the numbers together, and all the variables

3X-77=0

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

3X=77

X=77/3

X=25+2/3

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