12-3u=-3

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Solution for 12-3u=-3 equation: 



12-3u=-3

We move all terms to the left:

12-3u-(-3)=0

We add all the numbers together, and all the variables

-3u+15=0

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

-3u=-15

u=-15/-3

u=+5

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