-4=r/20-9

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Solution for -4=r/20-9 equation: 



-4=r/20-9

We move all terms to the left:

-4-(r/20-9)=0

We get rid of parentheses

-r/20+9-4=0

We multiply all the terms by the denominator


-r+9*20-4*20=0

We add all the numbers together, and all the variables

-1r+100=0

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

-r=-100

r=-100/-1

r=+100

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