75=x+(x^2)/20

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Solution for 75=x+(x^2)/20 equation: 


x in (-oo:+oo)

75 = (x^2)/20+x // - (x^2)/20+x

75-((x^2)/20)-x = 0

75-1/20*x^2-x = 0

DELTA = (-1)^2-(-1/20*4*75)

DELTA = 16

DELTA > 0

x = (16^(1/2)+1)/(-1/20*2) or x = (1-16^(1/2))/(-1/20*2)

x = -50 or x = 30

x in { -50, 30 }

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