3(1+2r)=21

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Solution for 3(1+2r)=21 equation: 



3(1+2r)=21

We move all terms to the left:

3(1+2r)-(21)=0

We add all the numbers together, and all the variables

3(2r+1)-21=0

We multiply parentheses

6r+3-21=0

We add all the numbers together, and all the variables

6r-18=0

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

6r=18

r=18/6

r=3

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