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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x-32 = 50 // - 50
4/x-50-32 = 0
4*x^-1 = 82 // : 4
x^-1 = 41/2
-1 < 0
1/(x^1) = 41/2 // * x^1
1 = 41/2*x^1 // : 41/2
2/41 = x^1
x = 2/41
x = 2/41
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