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desperate, please help.


I need help numerically solving a differential equation coupled with several
algebraic equations. New to Mathematica. Here's code:

NDSolve[{v'[x] == -F÷r, T[x] == 330 + 43.3*x, F = .9*163, C == 9.3, 
    k[x] == 31.1Exp(7906*(T - 360)/(T*360))
    , K[x] == 3.03*Exp(-830.3*((T - 333)/(T*333))), 
    r[x] == -k*C*(1 - (1 + 1/K)*x),
    v[0] == 0}, {v}
  , {x, 0, .7}]

Error code is:

NDSolve::"deql": "The first argument must have both an equation and an \
initial condition."

Any suggestions? What am I doing wrong? My head is sore from banging it against
the wall.

TIA.


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