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No 1. 3a  + 2a = 90
5a = 90
a = 90 : 5
a = 18

No 2. 46 + (a + 29) + (5a + 15) = 180
a + 5a = 180 - 46 - 29 - 15
6a = 90
a = 90 :  6
a = 15

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