90 by 7 - [{6 by 11 + (6 by 9 ÷ 6 by 7 ) of 23 by 5 } - 5
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3+2=7 means (3*2)+1=7
5+4=23 means (5*4)+3=23
7+6=47 means (7*6)+5=47
9+8=79 means (9*8)+7=79
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