8r+(-9r)=(-13)

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Solution for 8r+(-9r)=(-13) equation: 



8r+(-9r)=(-13)

We move all terms to the left:

8r+(-9r)-((-13))=0

We add all the numbers together, and all the variables

8r+(-9r)+13=0

We get rid of parentheses

8r-9r+13=0

We add all the numbers together, and all the variables

-1r+13=0

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

-r=-13

r=-13/-1

r=+13

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