-20=r/2

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Solution for -20=r/2 equation: 



-20=r/2

We move all terms to the left:

-20-(r/2)=0

We add all the numbers together, and all the variables

-(+r/2)-20=0

We get rid of parentheses

-r/2-20=0

We multiply all the terms by the denominator


-r-20*2=0

We add all the numbers together, and all the variables

-1r-40=0

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

-r=40

r=40/-1

r=-40

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