A company manufactures and sells a certain product. The demand function for the product is given by the equation:
$$ D(x) = 150 - 3x $$
where $D(x)$ is the number of units demanded, and $x$ is the price per unit in dollars. The supply function for the same product is given by:
$$ S(x) = 2x + 50 $$
where $S(x)$ is the number of units supplied. To find the equilibrium price, we need to set the demand equal to the supply:
$$ D(x) = S(x) $$
Determine the equilibrium price and calculate the value of $x$ that represents this price.