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2x + 5 + 57 = 180
2x + 62 = 180
2x = 180 - 62
2x = 118
x = 118/2
x = 59°
2x + 62 = 180
2x = 180 -62
2x = 118
x = 118/2
x = 59
Jadi nilai x = 59°