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s=%s
//to find C/E
a=10/(s*(s+1))
b=a/(1+(a*0.5*s))
c=b*(s+4) //shifting the summer to the left
//(s^2+6*s)/(10*(s+4)) * C == E + 3/(s+4)*(E+C)
Y= 10*(s+7)/(s^2+6*s-30) //solving the above equation
disp(Y,"C/E = ")
// to find C/R
d=c/(1+c*1) //using the associative law, exchange two summing points
e=1+(3/(s+4))
X= d*e
disp(X," C/R = ")
// to find C/N if r(s)=0
x= (-0.5*s)-(s+4)
k=10/(s*(s+1))
f=k*x //removing the summing point
V=1/(1-f)
disp(V,"C/N = ")
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