-12=1+4r+3

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Solution for -12=1+4r+3 equation: 



-12=1+4r+3

We move all terms to the left:

-12-(1+4r+3)=0

We add all the numbers together, and all the variables

-(4r+4)-12=0

We get rid of parentheses

-4r-4-12=0

We add all the numbers together, and all the variables

-4r-16=0

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

-4r=16

r=16/-4

r=-4

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