4u+12=7u-9

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Solution for 4u+12=7u-9 equation: 



4u+12=7u-9

We move all terms to the left:

4u+12-(7u-9)=0

We get rid of parentheses

4u-7u+9+12=0

We add all the numbers together, and all the variables

-3u+21=0

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

-3u=-21

u=-21/-3

u=+7

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