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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
18/x = 5/7.5 // - 5/7.5
18/x-(5/7.5) = 0
18/x-0.66666667 = 0
18*x^-1 = 0.66666667 // : 18
x^-1 = 0.03703704
-1 < 0
1/(x^1) = 0.03703704 // * x^1
1 = 0.03703704*x^1 // : 0.03703704
26.99999784 = x^1
x = 26.99999784
x = 26.99999784
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