1. 28 + 28 + x = 180

54 + x = 180

54 - 54 + x = 180 - 54

x = 126

2. 110 + 30 + x = 180

140 + x = 180

x = 40

3. 90 + 25 + x = 180

x = 65

4. x= 134

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