75(1/2)=1.25(100-r/4)

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Solution for 75(1/2)=1.25(100-r/4) equation: 


r in (-oo:+oo)

75*(1/2) = 1.25*(100-(r/4)) // - 1.25*(100-(r/4))

75*(1/2)-(1.25*(100-(r/4))) = 0

75*(1/2)-1.25*(100-(r/4)) = 0

75/2-1.25*(100-1/4*r) = 0

(-1.25*2*(100-1/4*r))/2+75/2 = 0

75-1.25*2*(100-1/4*r) = 0

0.625*r-175 = 0

(0.625*r-175)/2 = 0

(0.625*r-175)/2 = 0 // * 2

0.625*r-175 = 0

0.625*r-175 = 0 // + 175

0.625*r = 175 // : 0.625

r = 175/0.625

r = 280

r = 280

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