-4(r+9)=21

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Solution for -4(r+9)=21 equation: 



-4(r+9)=21

We move all terms to the left:

-4(r+9)-(21)=0

We multiply parentheses

-4r-36-21=0

We add all the numbers together, and all the variables

-4r-57=0

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

-4r=57

r=57/-4

r=-14+1/4

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