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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x+y+3/4 = 0
5*x^-1 = -(y+3/4) // : 5
x^-1 = (-(y+3/4))/5
-1 < 0
1/(x^1) = (-(y+3/4))/5 // * x^1
1 = x^1*((-(y+3/4))/5) // : (-(y+3/4))/5
-5*(y+3/4)^-1 = x^1
x = -5*(y+3/4)^-1
x = -5*(y+3/4)^-1
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