-9+x+3x=15

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Solution for -9+x+3x=15 equation: 



-9+x+3x=15

We move all terms to the left:

-9+x+3x-(15)=0

We add all the numbers together, and all the variables

4x-24=0

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

4x=24

x=24/4

x=6

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