-5/4r=-20

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Solution for -5/4r=-20 equation: 


r in (-oo:+oo)

(-5/4)*r = -20 // + 20

(-5/4)*r+20 = 0

20-5/4*r = 0 // - 20

-5/4*r = -20 // : -5/4

r = -20/(-5/4)

r = 16

r = 16

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