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x in (-oo:+oo)
(1/10)*x^2 = 3*x // - 3*x
(1/10)*x^2-(3*x) = 0
(1/10)*x^2-3*x = 0
1/10*x^2-3*x = 0
DELTA = (-3)^2-(0*1/10*4)
DELTA = 9
DELTA > 0
x = (9^(1/2)+3)/(1/10*2) or x = (3-9^(1/2))/(1/10*2)
x = 30 or x = 0
x in { 0, 30 }
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