u+2u=12

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Solution for u+2u=12 equation: 



u+2u=12

We move all terms to the left:

u+2u-(12)=0

We add all the numbers together, and all the variables

3u-12=0

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

3u=12

u=12/3

u=4

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