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2x + 6x + 20 = 180
8x + 20 = 180
8x = 180-20
8x = 160
x = 160/8
x = 20 derajat
B. sudut CBD = 6x + 20 = 6(20) + 20 =120 + 20 = 140 derajat
7. A. mencari X
2x + 3x + 30 = 180
5x + 30 = 180
5x = 180- 30
5x = 150
x = 150/5
x = 30 derajat
B. sudut ACB = 180 - 130 = 50 derajat
8. maaf blm bisa jwb