8r+r=-9

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Solution for 8r+r=-9 equation: 



8r+r=-9

We move all terms to the left:

8r+r-(-9)=0

We add all the numbers together, and all the variables

9r+9=0

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

9r=-9

r=-9/9

r=-1

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