Answer:
20
Explanation:
the pair angles = same side interior angles:
(3x-10)° + (5x+30)° = 180°
(3x + 5x - 10 + 30)° = 180°
(8x + 20)° = 180°
8x° = (180 - 20)°
x = 160° ÷ 8°
= 20
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