3(r+3)=12

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Solution for 3(r+3)=12 equation: 



3(r+3)=12

We move all terms to the left:

3(r+3)-(12)=0

We multiply parentheses

3r+9-12=0

We add all the numbers together, and all the variables

3r-3=0

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

3r=3

r=3/3

r=1

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