12u+4u-13u-3=15

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Solution for 12u+4u-13u-3=15 equation: 



12u+4u-13u-3=15

We move all terms to the left:

12u+4u-13u-3-(15)=0

We add all the numbers together, and all the variables

3u-18=0

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

3u=18

u=18/3

u=6

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