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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
70/100 = 60/x // - 60/x
70/100-(60/x) = 0
70/100-60*x^-1 = 0
-60*x^-1 = -7/10 // : -60
x^-1 = 7/600
-1 < 0
1/(x^1) = 7/600 // * x^1
1 = 7/600*x^1 // : 7/600
600/7 = x^1
x = 600/7
x = 600/7
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