3u+9=12

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Solution for 3u+9=12 equation: 



3u+9=12

We move all terms to the left:

3u+9-(12)=0

We add all the numbers together, and all the variables

3u-3=0

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

3u=3

u=3/3

u=1

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