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6*x^2-x-((12/2)*x)-3 = 0
6*x^2-x-6*x-3 = 0
6*x^2-7*x-3 = 0
DELTA = (-7)^2-(-3*4*6)
DELTA = 121
DELTA > 0
x = (121^(1/2)+7)/(2*6) or x = (7-121^(1/2))/(2*6)
x = 3/2 or x = -1/3
x in { -1/3, 3/2 }
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