-4r/5=1.28

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Solution for -4r/5=1.28 equation: 


r in (-oo:+oo)

(-4*r)/5 = 1.28 // - 1.28

(-4*r)/5-1.28 = 0

-4/5*r-1.28 = 0 // + 1.28

-4/5*r = 1.28 // : -4/5

r = 1.28/(-4/5)

r = -1.6

r = -1.6

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