72=15u-7u

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Solution for 72=15u-7u equation: 



72=15u-7u

We move all terms to the left:

72-(15u-7u)=0

We add all the numbers together, and all the variables

-(+8u)+72=0

We get rid of parentheses

-8u+72=0

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

-8u=-72

u=-72/-8

u=+9

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