-7m-[3n-{8m- (4n-10m)}] = ?
- 11m-5m
- 11m-7n
- 110-11m
- None of these
Explanation
-7m-[3n-{8m- (4n-10m)}] = ?
= - 7m - [ 3n - { 8m - (-10m +4n)]
= - 7m - [ 3n -( 8m +10m -4n )]
= -7m - (3n - (18m -4n )
= -7m - (3n +4n - 18m)
= -7m - (7n - 18m)
= 11m - 7n
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