-15=-9+2u

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Solution for -15=-9+2u equation: 



-15=-9+2u

We move all terms to the left:

-15-(-9+2u)=0

We add all the numbers together, and all the variables

-(2u-9)-15=0

We get rid of parentheses

-2u+9-15=0

We add all the numbers together, and all the variables

-2u-6=0

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

-2u=6

u=6/-2

u=-3

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