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12x = 180
x = 180:12 = 15
sudut z = 7x - 10 = 7(15) - 10 = 95
Jadi:
∠x + ∠y + ∠z = 180°
(2x + 5) + (3x + 5) + (7x - 10) = 180°
12x = 180°
x = 15°
∠z = 7x - 10
= 7.15 - 10
= 105 - 10
= 95°
Jadi besar sudut z adalah 95°