#6
2a(b + c) - 3b(a - c) = 2ab + 2ac - 3ab + 3bc = -ab + 2ac + 3bc
#7
3xy^3 - 12x^3y = 3×x×y×y×y - 3×2×2×x×x×x×y
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#6
2a(b + c) - 3b(a - c) = 2ab + 2ac - 3ab + 3bc = -ab + 2ac + 3bc
#7
3xy^3 - 12x^3y = 3×x×y×y×y - 3×2×2×x×x×x×y