X+y=85x-y=9

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Solution for X+y=85x-y=9 equation: 



X+X=85

We move all terms to the left:

X+X-(85)=0

We add all the numbers together, and all the variables

2X-85=0

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

2X=85

X=85/2

X=42+1/2

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