Factorising the polynomial 3a2 + 6ab - 6a, we get
3a (a + 2b + 2)
3a (a + 2b - 2)
6a (3a + b - 1)
2a (a + 2b - 2)
When we add 5a2b+6ab+7bc+54 and 14ab+8bc+16, we get: