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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*x)/x-(3*x)-x-(2*y)-((7/2)*y) = 0
(-7/2)*y-3*x-x-2*y+(5*x)/x = 0
5-4*x-11/2*y = 0 // - 5-11/2*y
-4*x = -(5-11/2*y) // : -4
x = (-(5-11/2*y))/(-4)
x = (5-11/2*y)/4
x = (5-11/2*y)/4
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