9+6r=87

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Solution for 9+6r=87 equation: 



9+6r=87

We move all terms to the left:

9+6r-(87)=0

We add all the numbers together, and all the variables

6r-78=0

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

6r=78

r=78/6

r=13

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