9x+8x+x=720

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Solution for 9x+8x+x=720 equation: 



9x+8x+x=720

We move all terms to the left:

9x+8x+x-(720)=0

We add all the numbers together, and all the variables

18x-720=0

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

18x=720

x=720/18

x=40

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