-4r/20-5

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Solution for -4r/20-5 equation: 


r in (-oo:+oo)

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

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

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

r = 5/(-1/5)

r = -25

r = -25

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