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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x = 9/7.5 // - 9/7.5
6/x-(9/7.5) = 0
6/x-1.2 = 0
6*x^-1 = 1.2 // : 6
x^-1 = 0.2
-1 < 0
1/(x^1) = 0.2 // * x^1
1 = 0.2*x^1 // : 0.2
5 = x^1
x = 5
x = 5
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