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((10*x)/2)*x-((5*x)/1)-3 = 0
((10*x)/2)*x-5*x-3 = 0
5*x^2-5*x-3 = 0
DELTA = (-5)^2-(-3*4*5)
DELTA = 85
DELTA > 0
x = (85^(1/2)+5)/(2*5) or x = (5-85^(1/2))/(2*5)
x = (85^(1/2)+5)/10 or x = (5-85^(1/2))/10
x in { (5-85^(1/2))/10, (85^(1/2)+5)/10 }
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