-5r/20=-4

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


r in (-oo:+oo)

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

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

4-1/4*r = 0 // - 4

-1/4*r = -4 // : -1/4

r = -4/(-1/4)

r = 16

r = 16

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