3u+21=6u-3

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Solution for 3u+21=6u-3 equation: 



3u+21=6u-3

We move all terms to the left:

3u+21-(6u-3)=0

We get rid of parentheses

3u-6u+3+21=0

We add all the numbers together, and all the variables

-3u+24=0

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

-3u=-24

u=-24/-3

u=+8

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