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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x = 5/12 // - 5/12
7/x-(5/12) = 0
7/x-5/12 = 0
7*x^-1 = 5/12 // : 7
x^-1 = 5/84
-1 < 0
1/(x^1) = 5/84 // * x^1
1 = 5/84*x^1 // : 5/84
84/5 = x^1
x = 84/5
x = 84/5
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