r-20-4r=-5(-4r-20)+18

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Solution for r-20-4r=-5(-4r-20)+18 equation: 



r-20-4r=-5(-4r-20)+18

We move all terms to the left:

r-20-4r-(-5(-4r-20)+18)=0

We add all the numbers together, and all the variables

-3r-(-5(-4r-20)+18)-20=0



We calculate terms in parentheses: -(-5(-4r-20)+18), so:

-5(-4r-20)+18

We multiply parentheses

20r+100+18

We add all the numbers together, and all the variables

20r+118

Back to the equation:

-(20r+118)



We get rid of parentheses

-3r-20r-118-20=0

We add all the numbers together, and all the variables

-23r-138=0

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

-23r=138

r=138/-23

r=-6

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