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x in (-oo:+oo)
((Y^2)/8)*c^2*d^2-(c^4*d*((3*x)/14)) = 0
((Y^2)/8)*c^2*d^2+(-3/14)*c^4*d*x = 0
1/8*Y^2*c^2*d^2-3/14*c^4*d*x = 0 // - 1/8*Y^2*c^2*d^2
-3/14*c^4*d*x = -(1/8*Y^2*c^2*d^2) // : -3/14*c^4*d
x = (-(1/8*Y^2*c^2*d^2))/(-3/14*c^4*d)
x = 7/12*Y^2*c^-2*d
x = 7/12*Y^2*c^-2*d
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