Pre-AlgebraHard SharePre-Algebra · Hard problemCombine like terms: 3a−5b+7a+2b−4a3a - 5b + 7a + 2b - 4a3a−5b+7a+2b−4a.A6a−4b6a - 4b6a−4bB12a−3b12a - 3b12a−3bC6a−3b6a - 3b6a−3bD6a+3b6a + 3b6a+3bCheck Show answer Walk through it step by step Practice more like this