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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
35 = 360/x // - 360/x
35-(360/x) = 0
35-360*x^-1 = 0
-360*x^-1 = -35 // : -360
x^-1 = 7/72
-1 < 0
1/(x^1) = 7/72 // * x^1
1 = 7/72*x^1 // : 7/72
72/7 = x^1
x = 72/7
x = 72/7
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