a + 3a + 5a = 180
9a =180
a = 20
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a + b + c = 180 b = 3a c = 5a Substituting the values of b and c into the first equation. a + 3a + 5a = 180 or 9a = 180 so that a = 20 then b = 3a = 3*20 = 60 and c = 5a = 5*20 = 100
2a + 3a = 5a
The given expression can be simplified to: 3b-a
-8a + 3a = (-8 + 3)a = (5)a = 5a
3a + 2a = 5a