15u=8u+21

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Solution for 15u=8u+21 equation: 



15u=8u+21

We move all terms to the left:

15u-(8u+21)=0

We get rid of parentheses

15u-8u-21=0

We add all the numbers together, and all the variables

7u-21=0

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

7u=21

u=21/7

u=3

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