System nicht-linearer Dglen in WolframAlphaPro?

Weiß jemand, wie man folgendes System nicht-linearer Differentialgleichungen in WolframAlphaPro löst?

-3 = 68000/12 x”(t) + (80000 – 20000) y'(t) z'(t)

1 = 20000 y”(t) + (68000 – 80000) x'(t) z'(t)

6 = 80000 z”(t) + (20000 – 68000) x'(t) y'(t)

x'(0) = 0; y'(0) = 0; z'(0) = 0

x”(0) = -36/68000; y”(0) = 1/20000; z”(0) = 6/80000