3(6+r)=21

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Solution for 3(6+r)=21 equation: 



3(6+r)=21

We move all terms to the left:

3(6+r)-(21)=0

We add all the numbers together, and all the variables

3(r+6)-21=0

We multiply parentheses

3r+18-21=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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