3(9+15r)=-648

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Solution for 3(9+15r)=-648 equation: 



3(9+15r)=-648

We move all terms to the left:

3(9+15r)-(-648)=0

We add all the numbers together, and all the variables

3(15r+9)-(-648)=0

We add all the numbers together, and all the variables

3(15r+9)+648=0

We multiply parentheses

45r+27+648=0

We add all the numbers together, and all the variables

45r+675=0

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

45r=-675

r=-675/45

r=-15

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