Can You Calculate Equilibrium Price An Equilibrium Quantity?

If you have quantity demanded(Qd) and quantity supplied(Qs) then you can calculate equilibrium price and quantity.  To find equilibrium price and quantity you have to find equilibrium point(EP).

EP=> Qd=Qs

suppose, Qd=100-2p &Qs=4p-80

EP=>100-2p=4p-80
   =>-2p-4p=-80-100
   =>-(2p+4p)=-(80+100)
   =>2p+4p=80+100
   =>6p=180
   =>p=180/6=30

so, equilibrium price is 30

and equilibrium quantity is, Qd=Qs
  =>100-2p=4p-80
  =>100-2.30=4.30-80
  =>100-60=120-80
  =>40=40

Hence, equilibrium quantity is 40 and equilibrium price is 30.

Q=1600-300
Q1400+700

TC = 400 + 4Q + 2Q^2
(MC = 2 + 4Q)

(MC = 2 + 4Q)
P = 260 – 2Q.

What are the expected equilibrium quantity, price, and profits