15=-7u+4u

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Solution for 15=-7u+4u equation: 



15=-7u+4u

We move all terms to the left:

15-(-7u+4u)=0

We add all the numbers together, and all the variables

-(-3u)+15=0

We get rid of parentheses

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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