X+y=78X-y=8

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Solution for X+y=78X-y=8 equation: 



X+X=78X-X=8

We move all terms to the left:

X+X-(78X-X)=0

We add all the numbers together, and all the variables

X+X-(+77X)=0

We add all the numbers together, and all the variables

2X-(+77X)=0

We get rid of parentheses

2X-77X=0

We add all the numbers together, and all the variables

-75X=0

X=0/-75

X=0

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