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5x - 18 = 3x + 42
5x - 3x = 42 + 18
2x = 60
x = 60/ 2
x = 30
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Answer:
x = 30°
A = 132°
Step-by-step explanation:
Angles A and B are alternate angles with respect to the parallel lines
⇒ ∠A = ∠B
⇒ 5x - 18° = 3x + 42°
⇒ 2x = 60°
⇒ x = 30°
⇒ A = 5x - 18° = 150° - 18° = 132°
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