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=12x + 30 =180
=12x = 180 -30
=12x =150
=x = 150: 12
=12,5
x = 14
ACB = 8 x = 8 x 12,5 = 100
4x + 8x + 30 = 180
4x + 8x = 180 - 30
12x = 150
x = 12,5
Sudut ACB = 8x
= 8(12,5)
= 100°