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15x=270
x=18
6) 5x+80=180
5x=100
x=20
15x = 360 - 90
x = 270/15
x = 18...... :) B
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6. 5x + 80 = 180........... karena garis EB & FC sejajar (digambar)
x = 100/5
x = 20..... B