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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/36 = 7/x // - 7/x
9/36-(7/x) = 0
9/36-7*x^-1 = 0
-7*x^-1 = -1/4 // : -7
x^-1 = 1/28
-1 < 0
1/(x^1) = 1/28 // * x^1
1 = 1/28*x^1 // : 1/28
28 = x^1
x = 28
x = 28
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