u+21=7u+6

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Solution for u+21=7u+6 equation: 



u+21=7u+6

We move all terms to the left:

u+21-(7u+6)=0

We get rid of parentheses

u-7u-6+21=0

We add all the numbers together, and all the variables

-6u+15=0

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

-6u=-15

u=-15/-6

u=2+1/2

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