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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-7/x-2 = 10 // - 10
-7/x-10-2 = 0
-7*x^-1 = 12 // : -7
x^-1 = -12/7
-1 < 0
1/(x^1) = -12/7 // * x^1
1 = -12/7*x^1 // : -12/7
-7/12 = x^1
x = -7/12
x = -7/12
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