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7*7 + 7 - 7 is one of many ways to do this.
The idiom, at sixes and sevens means that you are in a state of panic, confusion and uncertainty. You could use this idiom in a sentence by saying, she was at sixes and sevens as to whether or not to tell her best friend that her husband was being unfaithful.
Use four 5's to make 6
One way to use four fours to make 25 is 4 + 4 + 4 + √4, which equals 25.
99 + 9/9 = 100