value of G

hi all i've a doubt in a control system program
r(k)=input y(k)edback
u(k)*Gp=y(k)
u(k)=1/Kc(y(k)+G*(r(k)-y(k))
in the above equation what is the function of G
explain with a live example.. and how the eqution works
in this equation,
Gp=Kp/z-a Kc=8 Kp=8 GB
-Shyju
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