Find the sum of $- 3 a b + 7 c d - 5 q r; 2 r y + 8 q r - c d; 2 c d - 3 q r + a b - 2 r y$

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Solution

given, $- 3 a b + 7 c d - 5 q r + 2 r y + 8 q r - c d + 2 c d - 3 q r + a b - 2 r y$

Grouping the like terms,

$= (- 3 a b + a b) + (7 c d - c d) + (- 5 q r + 8 q r - 3 q r) + (2 r y - 2 r y)$

$= - 2 a b + 6 c d + 0 + 0$

$= - 2 a b + 6 c d$

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