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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
160/a = 0.2 // - 0.2
160/a-0.2 = 0
160*a^-1 = 0.2 // : 160
a^-1 = 0.00125
-1 < 0
1/(a^1) = 0.00125 // * a^1
1 = 0.00125*a^1 // : 0.00125
800 = a^1
a = 800
a = 800
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