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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15/x+7 = 5/6 // - 5/6
15/x-(5/6)+7 = 0
15/x-5/6+7 = 0
15*x^-1 = -37/6 // : 15
x^-1 = -37/90
-1 < 0
1/(x^1) = -37/90 // * x^1
1 = -37/90*x^1 // : -37/90
-90/37 = x^1
x = -90/37
x = -90/37
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