8-13r=-12r

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Solution for 8-13r=-12r equation: 



8-13r=-12r

We move all terms to the left:

8-13r-(-12r)=0

We get rid of parentheses

-13r+12r+8=0

We add all the numbers together, and all the variables

-1r+8=0

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

-r=-8

r=-8/-1

r=+8

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