-2(r+4)=21

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Solution for -2(r+4)=21 equation: 



-2(r+4)=21

We move all terms to the left:

-2(r+4)-(21)=0

We multiply parentheses

-2r-8-21=0

We add all the numbers together, and all the variables

-2r-29=0

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

-2r=29

r=29/-2

r=-14+1/2

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