X+y=712x+5y=7

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Solution for X+y=712x+5y=7 equation: 



X+X=7

We move all terms to the left:

X+X-(7)=0

We add all the numbers together, and all the variables

2X-7=0

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

2X=7

X=7/2

X=3+1/2

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