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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
138/100 = 207/x // - 207/x
138/100-(207/x) = 0
138/100-207*x^-1 = 0
-207*x^-1 = -69/50 // : -207
x^-1 = 1/150
-1 < 0
1/(x^1) = 1/150 // * x^1
1 = 1/150*x^1 // : 1/150
150 = x^1
x = 150
x = 150
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