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180 = 3x + 87
3x = 180 - 87
3x = 93
x = 93 : 3
x = 31
x - 27 = 31 - 27 = 4°
x - 29 = 31 - 29 = 2°
x + 143 = 31 + 143 = 174°
Jawaban yang bertulisan tebal :)