( a-b) 7 -7 ( b- a) = ( these are option 0 , 7a -7 b, 14 a - 14 b , 7 ( a-b ) (b -a) )
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Answer:
14a - 14b
(7a - 7b) - (7b - 7a)
7a - 7b -7b + 7a
= 14a - 14b
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