7=3(5+r)

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Solution for 7=3(5+r) equation: 



7=3(5+r)

We move all terms to the left:

7-(3(5+r))=0

We add all the numbers together, and all the variables

-(3(r+5))+7=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+7=0

We add all the numbers together, and all the variables

-3r-8=0

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

-3r=8

r=8/-3

r=-2+2/3

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