-13r+(-9r)-(-7)=-15

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Solution for -13r+(-9r)-(-7)=-15 equation: 



-13r+(-9r)-(-7)=-15

We move all terms to the left:

-13r+(-9r)-(-7)-(-15)=0

We add all the numbers together, and all the variables

-13r+(-9r)+22=0

We get rid of parentheses

-13r-9r+22=0

We add all the numbers together, and all the variables

-22r+22=0

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

-22r=-22

r=-22/-22

r=1

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