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