If your problem looks like this:
4a-a=_
the answer is... 3a
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4a2 - 9a + 5 = 4a2 - 4a -5a + 5 = 4a(a - 1) - 5(a - 1) = (4a - 5)(a - 1)
When you are using non-standard definitions of "plus" and "minus", or of "equal".
4
4a3 - 4a2 = 4a2*(a - 1)
+1.