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Answer:
division
Step-by-step explanation:
12( d/4 - 5) = 69
divide everything by 4 you get
3(d-1.25)=17.25
distribute
3d - 3.75 = 17.25
+3.75 = +3.75
3d=21
divide
21/3 = 7
d = 7
the last operation was division