Question
4a + 3b – 7a + 4b = _____
✓
Answer
4a + 3b – 7a + 4b
= 4a - 7a + 3b + 4b = -3a + 7b = 7b - 3a
= 4a - 7a + 3b + 4b = -3a + 7b = 7b - 3a
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