7.5=(x/25)((5-x)/100)

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Solution for 7.5=(x/25)((5-x)/100) equation: 


x in (-oo:+oo)

7.5 = (x/25)*((5-x)/100) // - (x/25)*((5-x)/100)

7.5-((x/25)*((5-x)/100)) = 0

(-1/2500)*x*(5-x)+7.5 = 0

7.5-1/2500*x*(5-x) = 0

7.5-1/2500*x*(5-x) = 0

1/2500*x^2-1/500*x+7.5 = 0

1/2500*x^2-1/500*x+7.5 = 0

1/2500*x^2-1/500*x+7.5 = 0

DELTA = (-1/500)^2-(1/2500*4*7.5)

DELTA = -0.011996

DELTA < 0

1 = 0

1 = 0

x belongs to the empty set

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