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Answer:
Step-by-step explanation:
To try to solve these problems, you could plug 'n play. If all the blanks are addition, you/ll be > 24
If all the blanks are subtraction, it will be < 0
Multiplication doesn't work for all of them.
I did notice that 15 + 9 = 24, 5*6 = 30, and you get back to 15 if you subtract 15 after multiplying 5 and 6