81-6\Xd73+7, 81\Xf7(9\Xd73), 36\Xf7(6+6)\Xd75

81-6×3+7
81÷(9×3)
36÷(6+6)×5

Order of Operations: PEMDAS

81 - 6 x 3 + 7

81 - 18 + 7

63 + 7

= 70

81/(9 x 3)

81/27

= 3

36/(6 + 6) x 5

36/12 x 5

3 x 5

= 15


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