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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x = 5.3 // - 5.3
8/x-5.3 = 0
8*x^-1 = 5.3 // : 8
x^-1 = 0.6625
-1 < 0
1/(x^1) = 0.6625 // * x^1
1 = 0.6625*x^1 // : 0.6625
1.50943396 = x^1
x = 1.50943396
x = 1.50943396
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