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x in (-oo:+oo)
(3/5)*x-((1/2)*x) = 1*x^2 // - 1*x^2
(3/5)*x-(1*x^2)-((1/2)*x) = 0
(3/5)*x-x^2+(-1/2)*x = 0
1/10*x-x^2 = 0
DELTA = (1/10)^2-(-1*0*4)
DELTA = 1/100
DELTA > 0
x = ((1/100)^(1/2)-1/10)/(-1*2) or x = (-(1/100)^(1/2)-1/10)/(-1*2)
x = 0 or x = 1/10
x in { 0, 1/10 }
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