Let C be the cost function, $C(x) = 3600 + 100x + 2x^2$ (in blue) and let R be the revenue function, $R(x) = 500x - 2x^2$ (in red) below.

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What are the equilibrium points where $x_1 < x_2$:

1. $x_1$=

2. $x_2$=