Answer:
3 degrees
Explanation:
Recall that the sum of the interior angles of a triangle is always 180 degrees. Here two interior angles are shown [ 25x and (57 + x) ], and the third can be calculated [180 - 45x].
Summing these up, we get (25x) + (57 + x) + (180 - 45x), or -20 - 19x, which we set equal to 180:
(25x) + (57 + x) + (180 - 45x) = 180. Subtract 180 from both sides, obtaining:
25x + 57 + x - 45x = 0. Then 26x - 45x = -57, or x = 3.