15=-5(-4+r)

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Solution for 15=-5(-4+r) equation: 



15=-5(-4+r)

We move all terms to the left:

15-(-5(-4+r))=0

We add all the numbers together, and all the variables

-(-5(r-4))+15=0



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

-5(r-4)

We multiply parentheses

-5r+20

Back to the equation:

-(-5r+20)



We get rid of parentheses

5r-20+15=0

We add all the numbers together, and all the variables

5r-5=0

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

5r=5

r=5/5

r=1

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