$\angle$ alt. int. on transversal between two lines: $\angle 1 = (3x + 10)^{\circ}$, $\angle 2 = (4x -…
$\angle$ alt. int. on transversal between two lines: $\angle 1 = (3x + 10)^{\circ}$, $\angle 2 = (4x - 20)^{\circ}$. For lines to be parallel, $x$ equals