3(2r-5)=21

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Solution for 3(2r-5)=21 equation: 



3(2r-5)=21

We move all terms to the left:

3(2r-5)-(21)=0

We multiply parentheses

6r-15-21=0

We add all the numbers together, and all the variables

6r-36=0

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

6r=36

r=36/6

r=6

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