20r=-20,

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Solution for 20r=-20, equation: 



20r=-20.

We move all terms to the left:

20r-(-20.)=0

We add all the numbers together, and all the variables

20r-(-20)=0

We add all the numbers together, and all the variables

20r+20=0

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

20r=-20

r=-20/20

r=-1

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