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6*x^2-((5/6)*x^2)+13*x-23+7 = 0
6*x^2+(-5/6)*x^2+13*x-23+7 = 0
31/6*x^2+13*x-16 = 0
DELTA = 13^2-(-16*4*31/6)
DELTA = 1499/3
DELTA > 0
x = ((1499/3)^(1/2)-13)/(2*31/6) or x = (-(1499/3)^(1/2)-13)/(2*31/6)
x = 3/31*((1499/3)^(1/2)-13) or x = -3/31*((1499/3)^(1/2)+13)
x in { -3/31*((1499/3)^(1/2)+13), 3/31*((1499/3)^(1/2)-13) }
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