3a+4b-15c,6(a+b),.12b -7c -6a
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3a+4b-15c+6(a+b)+12b-7c-6a
3a+4b-15c+6a+6b+12b-7c-6a
3a+6a-6a+4b+6b+12b-15c-7c
3a+22b-10cAnswer is 3a+22b-10c
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