(a+b) (2a-3b+c)-(2a-3b)c
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(a+b) (2a-3b+c)-(2a-3b)c
a(2a-3b+c) +b(2a-3b+c) - (2ac-3bc)
2a^2 -3ab + ac + 2ab -3b^2 +bc -2ac + 3bc
2a^2 -3b^2 -3ab +2ab +ac - 2ac +bc +3bc
2a^2 -3b^2 -ab -ac +4bc
Hope it's useful....
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