-15u-(-u)+13u=9

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Solution for -15u-(-u)+13u=9 equation: 



-15u-(-u)+13u=9

We move all terms to the left:

-15u-(-u)+13u-(9)=0

We add all the numbers together, and all the variables

-15u-(-1u)+13u-9=0

We add all the numbers together, and all the variables

-2u-(-1u)-9=0

We get rid of parentheses

-2u+1u-9=0

We add all the numbers together, and all the variables

-1u-9=0

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

-u=9

u=9/-1

u=-9

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