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(16/3)*x^2-2*x^2-(14*x)+15*x-72 = 0
(16/3)*x^2-2*x^2-14*x+15*x-72 = 0
10/3*x^2+x-72 = 0
DELTA = 1^2-(-72*10/3*4)
DELTA = 961
DELTA > 0
x = (961^(1/2)-1)/(2*10/3) or x = (-961^(1/2)-1)/(2*10/3)
x = 9/2 or x = -24/5
x in { -24/5, 9/2 }
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