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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.2*2.45 = 0.0821*300*(4.3/x) // - 0.0821*300*(4.3/x)
1.2*2.45-(0.0821*300*(4.3/x)) = 0
1.2*2.45-105.909*x^-1 = 0
-105.909*x^-1 = -2.94 // : -105.909
x^-1 = 0.02775968
-1 < 0
1/(x^1) = 0.02775968 // * x^1
1 = 0.02775968*x^1 // : 0.02775968
36.02347001 = x^1
x = 36.02347001
x = 36.02347001
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