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Answer:
Step-by-step explanation:
( x )° + 60° + ( x - 20 )° = 180°
x + 60 + x - 20 = 180
2x + 40 = 180
2x = 140
x = 70
m ( ∠A ) = 70°
m ( ∠B ) = 50°
m ( ∠C ) = 60°