-2(r+9)=-21

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Solution for -2(r+9)=-21 equation: 



-2(r+9)=-21

We move all terms to the left:

-2(r+9)-(-21)=0

We add all the numbers together, and all the variables

-2(r+9)+21=0

We multiply parentheses

-2r-18+21=0

We add all the numbers together, and all the variables

-2r+3=0

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

-2r=-3

r=-3/-2

r=1+1/2

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