-12=8+5r+

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Solution for -12=8+5r+ equation: 



-12=8+5r+

We move all terms to the left:

-12-(8+5r+)=0

We add all the numbers together, and all the variables

-5r-12=0

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

-5r=12

r=12/-5

r=-2+2/5

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