5a + 11
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The idea here is to combine terms that have the same variable (or, in more complicated cases, the same combination of variables). For example, 3a + 2a is the same as 5a.
5 x 3a= 15a
-8a + 3a = (-8 + 3)a = (5)a = 5a
9a +8 -2a -3 -5a = 2a +5
It is: 7a+1 when simplified