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50 + (2x - 7) + (5x - 3x) = 180
4x = 137
x = 34,25
b. Sudut 1 = 50
Sudut 2 = 2x - 7 = 2(34,25) - 7 = 61,5
Sudut 3 = 5x - 3x = 2x = 2(34,25) = 68,5