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equation solving


hi,
i'm a bit confused, hope someone help me...

here is my equations:

for a = =CE=BBd / (=CE=BBd + =CE=BBin)

P(0,0)= 1 /
( k + ((k-1) * (=CE=BBin/=CE=BCin)) + ((k-1) * (=CE=BBin/=CE=BCm)) +
(a * ((1-a^(n-k))/(1-a))) +
(a * ((1-a^(n-k))/(1-a)) * (=CE=BBin/=CE=BCin)) +
(a * ((1-a^(n-k))/(1-a)) * (=CE=BBin/=CE=BCM)) +
((a^(n-k) * (=CE=BBd/=CE=BCD))
)

Availability (A)  = P(0,0)*(k + (a * (1-a^(n-k))))

i want to find the optimal =CE=BBin which max. the availability.. is there
any way to solve without giving any numerical values? i use D[A, =CE=BBin]
but without numerical values i couldn't achieve any solution

and i want to plot A-=CE=BBin from the equation, what should i do for it?

best regards...



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