-20=4r-7(5-5r)

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Solution for -20=4r-7(5-5r) equation: 



-20=4r-7(5-5r)

We move all terms to the left:

-20-(4r-7(5-5r))=0

We add all the numbers together, and all the variables

-(4r-7(-5r+5))-20=0



We calculate terms in parentheses: -(4r-7(-5r+5)), so:

4r-7(-5r+5)

We multiply parentheses

4r+35r-35

We add all the numbers together, and all the variables

39r-35

Back to the equation:

-(39r-35)



We get rid of parentheses

-39r+35-20=0

We add all the numbers together, and all the variables

-39r+15=0

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

-39r=-15

r=-15/-39

r=5/13

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