Answer:
The two same-size angles are 64°; the third angle is 52°.
Step-by-step explanation:
Let x represent each of the same-size angles. Then the smaller angle is (x-12). The sum of angles is 180°, so we have ...
... x + x + (x-12) = 180
... 3x -12 = 180 . . . . . simplify
... x - 4 = 60 . . . . divide by 3
... x = 64 . . . . . . . add 4
... (x-12) = 64-12 = 52 . . . . . find the third angle
The same-size angles are 64°; the third angle is 52°.
