(a-b+5c)(a-b)-(a-b-c)(2a+3c)+(6a+b)(2c-3a-5b)
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Answer:
6a+5b+9c
Step-by-step explanation:
a-b+5c+a-b-a+b-c+2a+3a+6a+b+2c-3a-5b
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