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x in (-oo:+oo)
x^2+(5/3)*x+25/36 = 16/36 // - 16/36
x^2+(5/3)*x+25/36-(16/36) = 0
x^2+(5/3)*x+25/36-4/9 = 0
x^2+5/3*x+1/4 = 0
DELTA = (5/3)^2-(1/4*1*4)
DELTA = 16/9
DELTA > 0
x = ((16/9)^(1/2)-5/3)/(1*2) or x = (-(16/9)^(1/2)-5/3)/(1*2)
x = -1/6 or x = -3/2
x in { -3/2, -1/6 }
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