5aba-1-5a2b-c=5aba-1-ab-c =5aab-b-ab+ac =5aac-b⇒5aba-1-5a2b-c=5aac-b

5ab (a-1)-5a^2 (b-c)

5 ab (a - 1) - 5 a^{2} (b - c) = 5 a [b (a - 1) - a (b - c)] = 5 a [ab - b - ab + ac] = 5 a (ac - b) \Rightarrow 5 ab (a - 1) - 5 a^{2} (b - c) = 5 a (ac - b)

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