3(a + 2) = - 3a + 6, 3(2a + 6) = - 6a + 18, -3(a + 2) = - -3a - 6, 3(2a - 6) = - 6a - 18, a(a + 3) = - a² + 3a, -a(3 + a²) = - -3a - a³, -3a²(a + 2) = - -3a³ - 6a²,

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