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12*x^2+(24*x)/4 = 0
12*x^2+6*x = 0
DELTA = 6^2-(0*4*12)
DELTA = 36
DELTA > 0
x = (36^(1/2)-6)/(2*12) or x = (-36^(1/2)-6)/(2*12)
x = 0 or x = -1/2
x in { -1/2, 0 }
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