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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12.5/x = 7.5/1.5 // - 7.5/1.5
12.5/x-(7.5/1.5) = 0
12.5/x-5 = 0
12.5*x^-1 = 5 // : 12.5
x^-1 = 0.4
-1 < 0
1/(x^1) = 0.4 // * x^1
1 = 0.4*x^1 // : 0.4
2.5 = x^1
x = 2.5
x = 2.5
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