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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
980*(((1120*(52/100))/x)/100) = 4.2 // - 4.2
980*(((1120*(52/100))/x)/100)-4.2 = 0
142688/25*x^-1 = 4.2 // : 142688/25
x^-1 = 0.00073587
-1 < 0
1/(x^1) = 0.00073587 // * x^1
1 = 0.00073587*x^1 // : 0.00073587
1358.93568157 = x^1
x = 1358.93568157
x = 1358.93568157
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