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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x+y = 88 // - 88
3/x+y-88 = 0
3*x^-1 = -(y-88) // : 3
x^-1 = (88-y)/3
-1 < 0
1/(x^1) = (88-y)/3 // * x^1
1 = x^1*((88-y)/3) // : (88-y)/3
3*(88-y)^-1 = x^1
x = 3*(88-y)^-1
x = 3*(88-y)^-1
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