如何用matlab解七元方程

你最好能拿出了具体的实例来
我列举一个三元的方程。
编程及结果如下：
syms x y z
[x,y,z]= solve('2.5*x^2+2.3*y+5.1*z=1','0.8*x-y^3+3*z=10','2.6*x-5.1*y-3*z=6')

x =

-.96696585552124230797844234932470
-.29276389633521735242356905345835
2.0206292080435742685390062391509-1.0408286755817770570964427895888*i
2.0206292080435742685390062391509+1.0408286755817770570964427895888*i
-4.0427643321153444383380005377594+1.3134657749177045040872428073588*i
-4.0427643321153444383380005377594-1.3134657749177045040872428073588*i

y =

-2.0622341706505605758403048956882
-1.9277456317595315489669706344260
.82107162649392674173018854002225-2.3730152053878645061220643320005*i
.82107162649392674173018854002225+2.3730152053878645061220643320005*i
1.1739182