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x in (-oo:+oo)
((6*x)/4)*x+7*x+(2/4)*x+3+3 = 0
3/2*x^2+15/2*x+6 = 0
DELTA = (15/2)^2-(3/2*4*6)
DELTA = 81/4
DELTA > 0
x = ((81/4)^(1/2)-15/2)/(3/2*2) or x = (-(81/4)^(1/2)-15/2)/(3/2*2)
x = -1 or x = -4
x in { -4, -1 }
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