-3(a+b)+4(2a-3b)-(2a-b)
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3 (a+b) + 4(2a-3b) - (2a-b)
= 3a+3b +8a-12b -2a +b
= 3a+8a-2a +3b -12b +b
= 9a +8b
= 3a+3b +8a-12b -2a +b
= 3a+8a-2a +3b -12b +b
= 9a +8b
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