12u+u=15

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Solution for 12u+u=15 equation: 



12u+u=15

We move all terms to the left:

12u+u-(15)=0

We add all the numbers together, and all the variables

13u-15=0

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

13u=15

u=15/13

u=1+2/13

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