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5x - 2x = 50 + 40
3x = 90
x = 30
2x = 2 x 30 = 60° = ∠C = ∠ACB
∠A + ∠B + ∠C = 180
50 + ∠B + 60 = 180
∠B = 70 = ∠ABC ( C )
semoga jelas dan membantu ya