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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x+4/y = 44 // - 44
3/x+4/y-44 = 0
3*x^-1 = -(4*y^-1-44) // : 3
x^-1 = (44-(4*y^-1))/3
-1 < 0
1/(x^1) = (44-(4*y^-1))/3 // * x^1
1 = x^1*((44-(4*y^-1))/3) // : (44-(4*y^-1))/3
3*(44-4*y^-1)^-1 = x^1
x = 3*(44-4*y^-1)^-1
x = 3*(44-4*y^-1)^-1
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