Answer:
1. <a = 90
2. <b = 45
3. <c = 45
4. x is 10
Explanation:
1. <a = 135 - 45 = 90
2. <b = 180 - 135 = 45
3. <c = <b = 45
4. 5x = 7x -20
2x = 20
x = 10
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