3(4r+1)=-21

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Solution for 3(4r+1)=-21 equation: 



3(4r+1)=-21

We move all terms to the left:

3(4r+1)-(-21)=0

We add all the numbers together, and all the variables

3(4r+1)+21=0

We multiply parentheses

12r+3+21=0

We add all the numbers together, and all the variables

12r+24=0

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

12r=-24

r=-24/12

r=-2

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