9r-7r=-30

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Solution for 9r-7r=-30 equation: 



9r-7r=-30

We move all terms to the left:

9r-7r-(-30)=0

We add all the numbers together, and all the variables

2r+30=0

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

2r=-30

r=-30/2

r=-15

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