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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
60/100 = 287/x // - 287/x
60/100-(287/x) = 0
60/100-287*x^-1 = 0
-287*x^-1 = -3/5 // : -287
x^-1 = 3/1435
-1 < 0
1/(x^1) = 3/1435 // * x^1
1 = 3/1435*x^1 // : 3/1435
1435/3 = x^1
x = 1435/3
x = 1435/3
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