The answer is 23. Simply add the numbers together as you would 2+2 to get the answer. You can use a calculator to check your work.
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89
144 9+7 = 16 and 9*16 = 144
As written, that is true. (7 - 1) + 8 = 7 - (1 + 8) is not true.
you do 3 plus 5 first then you get 8 you have to find out what minus 7 equals 8
20