3x-8x=9

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Solution for 3x-8x=9 equation: 



3x-8x=9

We move all terms to the left:

3x-8x-(9)=0

We add all the numbers together, and all the variables

-5x-9=0

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

-5x=9

x=9/-5

x=-1+4/5

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