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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(9*70)/x = 2.8 // - 2.8
(9*70)/x-2.8 = 0
630*x^-1 = 2.8 // : 630
x^-1 = 0.00444444
-1 < 0
1/(x^1) = 0.00444444 // * x^1
1 = 0.00444444*x^1 // : 0.00444444
225.000225 = x^1
x = 225.000225
x = 225.000225
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