-15u-21=5u+21

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Solution for -15u-21=5u+21 equation: 



-15u-21=5u+21

We move all terms to the left:

-15u-21-(5u+21)=0

We get rid of parentheses

-15u-5u-21-21=0

We add all the numbers together, and all the variables

-20u-42=0

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

-20u=42

u=42/-20

u=-2+1/10

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