15-2r/80-4r=0.25

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Solution for 15-2r/80-4r=0.25 equation: 


r in (-oo:+oo)

15-((2*r)/80)-(4*r) = 0.25 // - 0.25

15-((2*r)/80)-(4*r)-0.25 = 0

(-1/40)*r-4*r-0.25+15 = 0

14.75-161/40*r = 0 // - 14.75

-161/40*r = -14.75 // : -161/40

r = -14.75/(-161/40)

r = 3.66459627

r = 3.66459627

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