15-17u=-20u

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Solution for 15-17u=-20u equation: 



15-17u=-20u

We move all terms to the left:

15-17u-(-20u)=0

We get rid of parentheses

-17u+20u+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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