Question: solving 4 equations with 4 unknowns

Hi all, I wish to solve in Maple 4 equations with 4 unknowns. I do exactly what is in the example, but Maple produces an error. Perhaps someone can see, where I make the mistake.

restart:
G1:=a*x^3 + b*x^2:
G2:=c*(x-1)^3 +d*(x-1)^2:
eq1:=subs(x=u, G1=G2):
eq2:=subs(x=u, diff(G2,x)-diff(G1,x)):
eq3:=subs(x=u, diff(G2,x$2)-diff(G1,x$2)):
eq4:=subs(x=u, diff(G2,x$3)-diff(G1,x$3)):
sol:=solve({eq1=0, eq2=0, eq3=0, eq4=1},{a,b,c,d});
Error, invalid input: solve expects its 1st argument, eqs, to be of type {`and`, `not`, `or`, algebraic, relation(algebraic), ({list, set})({`and`, `not`, `or`, algebraic, relation(algebraic)})}, but received {6*c-6*a = 1, 6*c*(u-1)+2*d-6*a*u-2*b = 0, 3*c*(u-1)^2+2*d*(u-1)-3*a*u^2-2*b*u = 0, (a*u^3+b*u^2 = c*(u-1)^3+d*(u-1)^2) = 0}