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