x+2x+6x=720

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Solution for x+2x+6x=720 equation: 



x+2x+6x=720

We move all terms to the left:

x+2x+6x-(720)=0

We add all the numbers together, and all the variables

9x-720=0

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

9x=720

x=720/9

x=80

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