Answer:
x = -14
Explanation:
To start since the angles are congruent then they must be equal to each other, so we start by setting them equal to each other. The equation will be 4x + 188 = 6x + 216
Next we solve for x, subtracting 188 and 6x from each side. The new equation will be
-2x = 28
Then divide both sides by negative 2 to get x = -14.