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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1250/x = 2.9 // - 2.9
1250/x-2.9 = 0
1250*x^-1 = 2.9 // : 1250
x^-1 = 0.00232
-1 < 0
1/(x^1) = 0.00232 // * x^1
1 = 0.00232*x^1 // : 0.00232
431.03448276 = x^1
x = 431.03448276
x = 431.03448276
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