12-2r/80-4r=0.25

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Solution for 12-2r/80-4r=0.25 equation: 


r in (-oo:+oo)

12-((2*r)/80)-(4*r) = 0.25 // - 0.25

12-((2*r)/80)-(4*r)-0.25 = 0

(-1/40)*r-4*r-0.25+12 = 0

11.75-161/40*r = 0 // - 11.75

-161/40*r = -11.75 // : -161/40

r = -11.75/(-161/40)

r = 2.91925466

r = 2.91925466

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