7r+9=-8r

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Solution for 7r+9=-8r equation: 



7r+9=-8r

We move all terms to the left:

7r+9-(-8r)=0

We get rid of parentheses

7r+8r+9=0

We add all the numbers together, and all the variables

15r+9=0

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

15r=-9

r=-9/15

r=-3/5

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