720=21x-20x

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Solution for 720=21x-20x equation: 



720=21x-20x

We move all terms to the left:

720-(21x-20x)=0

We add all the numbers together, and all the variables

-(+x)+720=0

We get rid of parentheses

-x+720=0

We add all the numbers together, and all the variables

-1x+720=0

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

-x=-720

x=-720/-1

x=+720

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