-2/5r=-20

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Solution for -2/5r=-20 equation: 


r in (-oo:+oo)

(-2/5)*r = -20 // + 20

(-2/5)*r+20 = 0

20-2/5*r = 0 // - 20

-2/5*r = -20 // : -2/5

r = -20/(-2/5)

r = 50

r = 50

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