X-8a=15

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Solution for X-8a=15 equation: 



X-8X=15

We move all terms to the left:

X-8X-(15)=0

We add all the numbers together, and all the variables

-7X-15=0

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

-7X=15

X=15/-7

X=-2+1/7

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