7rr=-2

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Solution for 7rr=-2 equation: 



7rr=-2

We move all terms to the left:

7rr-(-2)=0

We add all the numbers together, and all the variables

7rr+2=0

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

7rr=-2

r=-2/1

r=-2

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