15=3(r+1)

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Solution for 15=3(r+1) equation: 



15=3(r+1)

We move all terms to the left:

15-(3(r+1))=0



We calculate terms in parentheses: -(3(r+1)), so:

3(r+1)

We multiply parentheses

3r+3

Back to the equation:

-(3r+3)



We get rid of parentheses

-3r-3+15=0

We add all the numbers together, and all the variables

-3r+12=0

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

-3r=-12

r=-12/-3

r=+4

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