-8=r-12

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Solution for -8=r-12 equation: 



-8=r-12

We move all terms to the left:

-8-(r-12)=0

We get rid of parentheses

-r+12-8=0

We add all the numbers together, and all the variables

-1r+4=0

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

-r=-4

r=-4/-1

r=+4

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