X+y=8.

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Solution for X+y=8. equation: 



X+X=8.

We move all terms to the left:

X+X-(8.)=0

We add all the numbers together, and all the variables

X+X-8=0

We add all the numbers together, and all the variables

2X-8=0

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

2X=8

X=8/2

X=4

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