7ab+6ab+(-3a)+9b+6a-3b (answer is 10a +12b)
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Answer:
13ab + 3a + (-6b)
Step-by-step explanation:
7ab + 6ab + (-3a) + 9b + 6a -3b
= 13ab + (-3a) + 9b + 6a -3b
= 13ab + 3a + (-6b)
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