7u-3u-u=15

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Solution for 7u-3u-u=15 equation: 



7u-3u-u=15

We move all terms to the left:

7u-3u-u-(15)=0

We add all the numbers together, and all the variables

3u-15=0

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

3u=15

u=15/3

u=5

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