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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-18/x = 15/7 // - 15/7
-18/x-(15/7) = 0
-18/x-15/7 = 0
-18*x^-1 = 15/7 // : -18
x^-1 = -5/42
-1 < 0
1/(x^1) = -5/42 // * x^1
1 = -5/42*x^1 // : -5/42
-42/5 = x^1
x = -42/5
x = -42/5
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