Solve : $a (4 a - b) + 2 b (4 a - b) - c (4 a - b)$

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Solution

$a (4 a - b) + 2 b (4 a - b) - c (4 a - b)$

$(4 a - b) (a + 2 b - c)$

$4 a^{2} + 8 a b - 4 a c - a b - 2 b^{2} + b c$

$4 a^{2} - 2 b^{2} + 7 a b + b c - 4 a c$

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