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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x = 15/7.5 // - 15/7.5
2/x-(15/7.5) = 0
2/x-2 = 0
2*x^-1 = 2 // : 2
x^-1 = 1
-1 < 0
1/(x^1) = 1 // * x^1
1 = 1*x^1 // : 1
1 = x^1
x = 1
x = 1
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