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Answer:
Step-by-step explanation:
The angle marked 5x° is one of two acute angles in an isosceles right triangle, so is 45°.
5x° = 45°
x = 9 . . . . . . . divide by 5°
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The side lengths are equal, so ...
7y -9 = 5y +15
2y = 24 . . . . . . . . add 9-5y
y = 12 . . . . . . . . . .divide by 2
