solve错在哪里？？ 求助！！！

[debateshang]

可能没有显示解我把y值直接带入solve中求解出错信息是
solve('10*(10*exp(x)*((5*m*exp(4*x-4)*a+5*n*exp(-x+1)*c)*(m*exp(4*x-4)*a+n*exp(-x+1)*c)+(5*p*exp(4*x-4)*a+5*q*exp(-x+1)*c)*(p*exp(4*x-4)*a+q*exp(-x+1)*c)+5*(m*exp(4*x-4)*a+n*exp(-x+1)*c)^2+5*(p*exp(4*x-4)*a+q*exp(-x+1)*c)^2)+10*exp(-2*x)*((-3*m*exp(4*x-4)*b-3*n*exp(-x+1)*d)*(m*exp(4*x-4)*a+n*exp(-x+1)*c)+(-3*p*exp(4*x-4)*b-3*q*exp(-x+1)*d)*(p*exp(4*x-4)*a+q*exp(-x+1)*c)+5*(m*exp(4*x-4)*a+n*exp(-x+1)*c)*(m*exp(4*x-4)*b+n*exp(-x+1)*d)+5*(p*exp(4*x-4)*a+q*exp(-x+1)*c)*(p*exp(4*x-4)*b+q*exp(-x+1)*d)))*exp(x)+10*(10*exp(x)*((5*m*exp(4*x-4)*a+5*n*exp(-x+1)*c)*(m*exp(4*x-4)*b+n*exp(-x+1)*d)+(5*p*exp(4*x-4)*a+5*q*exp(-x+1)*c)*(p*exp(4*x-4)*b+q*exp(-x+1)*d)-3*(m*exp(4*x-4)*a+n*exp(-x+1)*c)*(m*exp(4*x-4)*b+n*exp(-x+1)*d)-3*(p*exp(4*x-4)*a+q*exp(-x+1)*c)*(p*exp(4*x-4)*b+q*exp(-x+1)*d))+10*exp(-2*x)*((-3*m*exp(4*x-4)*b-3*n*exp(-x+1)*d)*(m*exp(4*x-4)*b+n*exp(-x+1)*d)+(-3*p*exp(4*x-4)*b-3*q*exp(-x+1)*d)*(p*exp(4*x-4)*b+q*exp(-x+1)*d)-3*(m*exp(4*x-4)*b+n*exp(-x+1)*d)^2-3*(p*exp(4*x-4)*b+q*exp(-x+1)*d)^2))*exp(-2*x)')
??? Error using ==> solve at 162
Unable to find closed form solution