28=4+3(r-5)

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Solution for 28=4+3(r-5) equation: 



28=4+3(r-5)

We move all terms to the left:

28-(4+3(r-5))=0



We calculate terms in parentheses: -(4+3(r-5)), so:

4+3(r-5)

determiningTheFunctionDomain
3(r-5)+4

We multiply parentheses

3r-15+4

We add all the numbers together, and all the variables

3r-11

Back to the equation:

-(3r-11)



We get rid of parentheses

-3r+11+28=0

We add all the numbers together, and all the variables

-3r+39=0

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

-3r=-39

r=-39/-3

r=+13

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