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Anonymous
the 3 in 3a is called a coefficient.
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-3(a^2 - 3a + 7)
3 a b =3a b
3a2
"a" plus "3a" is equal to 4a. (3a+a=4a). You already have 3 "a's" and then you add another "a."
3a + 9 =3X(a + 3)