-20=r/2-10

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Solution for -20=r/2-10 equation: 



-20=r/2-10

We move all terms to the left:

-20-(r/2-10)=0

We get rid of parentheses

-r/2+10-20=0

We multiply all the terms by the denominator


-r+10*2-20*2=0

We add all the numbers together, and all the variables

-1r-20=0

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

-r=20

r=20/-1

r=-20

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