-1/5r=-20

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Solution for -1/5r=-20 equation: 


r in (-oo:+oo)

(-1/5)*r = -20 // + 20

(-1/5)*r+20 = 0

20-1/5*r = 0 // - 20

-1/5*r = -20 // : -1/5

r = -20/(-1/5)

r = 100

r = 100

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