720=9x+8x+x

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



720=9x+8x+x

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(+18x)+720=0

We get rid of parentheses

-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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