72=7u+2u

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Solution for 72=7u+2u equation: 



72=7u+2u

We move all terms to the left:

72-(7u+2u)=0

We add all the numbers together, and all the variables

-(+9u)+72=0

We get rid of parentheses

-9u+72=0

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

-9u=-72

u=-72/-9

u=+8

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