kailymartin56631 kailymartin56631 25-02-2024 Mathematics contestada Simplify the expression by combining like terms: 7a - 7ab + 3a² + 6ab - a. a) 10a - ab + 3a² b) 6a - ab + 3a² c) 9a + ab + 3a² d) 10a + ab + 3a²