-r=4*(r-5)

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Solution for -r=4*(r-5) equation: 



-r=4(r-5)

We move all terms to the left:

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

We add all the numbers together, and all the variables

-1r-(4(r-5))=0



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

4(r-5)

We multiply parentheses

4r-20

Back to the equation:

-(4r-20)



We get rid of parentheses

-1r-4r+20=0

We add all the numbers together, and all the variables

-5r+20=0

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

-5r=-20

r=-20/-5

r=+4

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