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The question is in the figure below.

The question is in the figure below.-example-1
User John Whish
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If a ║ b then m<3 + m<6 = 180 (same-sided interior angles)
so
2x + 15 + 3x + 10 = 180
5x + 25 = 180
5x = 155
x = 31

Answer
x = 31 makes a ║ b

User Dauren Akilbekov
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