12u+3u=18

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Solution for 12u+3u=18 equation: 



12u+3u=18

We move all terms to the left:

12u+3u-(18)=0

We add all the numbers together, and all the variables

15u-18=0

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

15u=18

u=18/15

u=1+1/5

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