Answer:
○ [tex]\displaystyle -1155[/tex]
Step-by-step explanation:
According to the Order of Operations [GEMS\BOMDAS\PEMDAS etc.], Subtraction & Addition are evaluated after Division & Multiplication:
[tex]\displaystyle 68 \times 27 - 81 +\:? = 600 \\ 1836 - 81 +\:? = 600 \\ 1755 +\:? = 600 \\ \\ -1155 =\:?[/tex]
I am joyous to assist you anytime.