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8 - (42/7) + (7 x 3) = 23
== == 7/12 - 11/12 = -4/12 or -1/3.
It is: (15-7)*(12-9) = 24
You can get 55 by performing the following operations: First, multiply 7 by 12 to get 84. Then, subtract the product of 3 and 2, which is 6, from 84. This gives you 84 - 6 = 78, which is not correct. A correct way to achieve 55 is: Multiply 7 by 12 to get 84, then subtract 3 and 2 multiplied together, which is 6. So, 84 - 6 = 78. Sorry, it seems I made a mistake in calculation. There is no straightforward way to reach 55 using just the numbers 3, 7, 12, and 2 with basic operations.
Subtract two, multiply by two, subtract one. :)