I wanna solve to solve

my solve equation like this....

[R2,x]=solve('((1-R2)/(1-R1)*-(b/c*R2))*x^2+(1-R2)/(1-R1)-b/c=0','((2-R1-R2)/(1-R1))*a*x^2+(b+c)*(1-R2)*x+a*(((1-R2)/(1-R1)+R1)+R2)=0','R2,x');

it is very complex i think.

so replace number(by input) from coefficient(R1,a,b,c) before!! executing solve equation.(Don't say that first solve second subs)

To my purpose, chane my code

a=input('a:'); b=input('b:'); c=input('c:'); R1=input('R1'); fn1=((1-R2)/(1-R1)*R1-(b/c*R2))*x^2+(1-R2)/(1-R1)-b/c; fn2=((2-R1-R2)/(1-R1))*a*x^2+(b+c)*(1-R2)*x+a*(((1-R2)/(1-R1)+R1)+R2); [R2,x]=solve('fn1=0','fn2=0','R2,x')

but it doesn't work!! help me!!!