15u-6u-3u=18

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Solution for 15u-6u-3u=18 equation: 



15u-6u-3u=18

We move all terms to the left:

15u-6u-3u-(18)=0

We add all the numbers together, and all the variables

6u-18=0

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

6u=18

u=18/6

u=3

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