Explanation:
subtract 3 from 7 to get 4
18 x 4 = 18 x 7 + 18 (-3)
multiply 18 and 4 to get 72
72= 18 x 7 + 18 (-3)
multiply 18 and 7 to get 126
multiply 18 and -3 to get -54
72 = 126 - 54
subtract 54 from 126 to get 72
72 = 72
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