21/4 - [ 11/5 + 17/10] is =?
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21/4 - [ 11(10)+17(5)/5x10]
21/4 - [110+85/50]
21/4 - [195/50]
21/4 - 39/10
21(10) - 39(4)/4x10
210-156/40
54/40= 27/20
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