X-8c=9

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Solution for X-8c=9 equation: 



X-8X=9

We move all terms to the left:

X-8X-(9)=0

We add all the numbers together, and all the variables

-7X-9=0

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

-7X=9

X=9/-7

X=-1+2/7

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