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Kelas: 1 smp
2x + 10 = 5x - 80
2x - 5x = -80 - 10
-3x = -90
x = -90/-3
x = 30
∠FCD = 180 - (2x + 10)
= 180 - (2 . 30 + 10)
= 180 - (60 + 10)
= 180 - 70
= 110