-12r+12=-8r+40

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Solution for -12r+12=-8r+40 equation: 



-12r+12=-8r+40

We move all terms to the left:

-12r+12-(-8r+40)=0

We get rid of parentheses

-12r+8r-40+12=0

We add all the numbers together, and all the variables

-4r-28=0

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

-4r=28

r=28/-4

r=-7

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