-21=5u-6

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Solution for -21=5u-6 equation: 



-21=5u-6

We move all terms to the left:

-21-(5u-6)=0

We get rid of parentheses

-5u+6-21=0

We add all the numbers together, and all the variables

-5u-15=0

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

-5u=15

u=15/-5

u=-3

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