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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
45/80 = 60/x // - 60/x
45/80-(60/x) = 0
45/80-60*x^-1 = 0
-60*x^-1 = -9/16 // : -60
x^-1 = 3/320
-1 < 0
1/(x^1) = 3/320 // * x^1
1 = 3/320*x^1 // : 3/320
320/3 = x^1
x = 320/3
x = 320/3
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