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Answer:
9 and 10 are supplementary
Explanation:
9. (20x + 30) + (15x + 10) = 180
35x + 40 = 180
35x = 140
x= 4
10. (2x + 10) + (11x + 14) = 180
13x + 24 = 180
13x = 156
x = 12
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