To solve this, we need to find all the angles within the triangle. We know one angle (f) is 33 degrees because 147 + f = 180 = f = 33. Next we need to set up two more formulas to solve for x:
4x + y = 180
x + y + 33 = 180 => x + y = 147
Next, we can isolate one of the variables in one of the formulas and plug it back into the other:
x + y = 147 => y = 147 - x
4x + y = 180 => 4x + 147 - x = 180 => 3x + 147 = 180 => 3x = 33 => x = 11
