-3(u+21)=12

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Solution for -3(u+21)=12 equation: 



-3(u+21)=12

We move all terms to the left:

-3(u+21)-(12)=0

We multiply parentheses

-3u-63-12=0

We add all the numbers together, and all the variables

-3u-75=0

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

-3u=75

u=75/-3

u=-25

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