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Anonymous
It is the 5 in 5a+2
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The given expression can be simplified to: 3b-a
It is an expression because it does not contain an equality sign.
a + 3a + 5a = 180 9a =180 a = 20
the answer is 6a
-8a + 3a = (-8 + 3)a = (5)a = 5a