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3x + 5x + 7x = 180
15x = 180
x = 12
yang terkecil kan 3x, jadi :
3.12 = 36derajat
semoga bermanfaat!
caranya :
3x + 5x + 7x = 180
15x = 180
x = 12
yg terkecil = 3x =>3(12) = 36