42=3(r+5)

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Solution for 42=3(r+5) equation: 



42=3(r+5)

We move all terms to the left:

42-(3(r+5))=0



We calculate terms in parentheses: -(3(r+5)), so:

3(r+5)

We multiply parentheses

3r+15

Back to the equation:

-(3r+15)



We get rid of parentheses

-3r-15+42=0

We add all the numbers together, and all the variables

-3r+27=0

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

-3r=-27

r=-27/-3

r=+9

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