-21=4r+3

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Solution for -21=4r+3 equation: 



-21=4r+3

We move all terms to the left:

-21-(4r+3)=0

We get rid of parentheses

-4r-3-21=0

We add all the numbers together, and all the variables

-4r-24=0

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

-4r=24

r=24/-4

r=-6

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