(Answered) (Advanced analysis) The demand for commodity X is represented by the equation P = 30 0.2Q and…

➤ How do you find equilibrium quantity from linear demand and supply curves?
For linear curves P = a − bQ and P = c + dQ, solve for Q by equating and rearranging: Q = (a − c)/(b + d). Here a = 30, c = 12, b = d = 0.2, so Q = (30 − 12)/(0.2 + 0.2) = 18/0.4 = 45 units. That is the equilibrium quantity.