Px+76=qx+76 for which values of p and q have infinitely many solutions?

if x = 0, P and Q hace infinite solutions

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180