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A + B + C = 180
4x + 10 + 5x - 30 + 6x - 40 = 180
4x + 5x + 6x + 10 - 30 - 40 = 180
15x - 60 = 180
15x = 180 + 60
15x = 240
x = 240/15
x = 16
masukkan nilai x
A = 4(16) + 10
= 74
B = 5(16) - 30
= 50
C = 6(16) - 40
= 56