21u-(-10u)=9+15

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Solution for 21u-(-10u)=9+15 equation: 



21u-(-10u)=9+15

We move all terms to the left:

21u-(-10u)-(9+15)=0

We add all the numbers together, and all the variables

21u-(-10u)-24=0

We get rid of parentheses

21u+10u-24=0

We add all the numbers together, and all the variables

31u-24=0

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

31u=24

u=24/31

u=24/31

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