9r+7r=-64

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Solution for 9r+7r=-64 equation: 



9r+7r=-64

We move all terms to the left:

9r+7r-(-64)=0

We add all the numbers together, and all the variables

16r+64=0

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

16r=-64

r=-64/16

r=-4

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