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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
70 = 120/x // - 120/x
70-(120/x) = 0
70-120*x^-1 = 0
-120*x^-1 = -70 // : -120
x^-1 = 7/12
-1 < 0
1/(x^1) = 7/12 // * x^1
1 = 7/12*x^1 // : 7/12
12/7 = x^1
x = 12/7
x = 12/7
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