(2а + 1)(b + 3) = 2a•b + 2a•3 + 1•b + 1•3 =
2ab + 6a + b + 3.
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(2а + 1)(b + 3) = 2a•b + 2a•3 + 1•b + 1•3 =
2ab + 6a + b + 3.