X+7y=129

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Solution for X+7y=129 equation: 



X+7X=129

We move all terms to the left:

X+7X-(129)=0

We add all the numbers together, and all the variables

8X-129=0

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

8X=129

X=129/8

X=16+1/8

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