9r-(64r-40)=-15

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Solution for 9r-(64r-40)=-15 equation: 



9r-(64r-40)=-15

We move all terms to the left:

9r-(64r-40)-(-15)=0

We add all the numbers together, and all the variables

9r-(64r-40)+15=0

We get rid of parentheses

9r-64r+40+15=0

We add all the numbers together, and all the variables

-55r+55=0

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

-55r=-55

r=-55/-55

r=1

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