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Answer:12t+15y+17k
Step-by-step explanation: We need to organize this expression into groups of like terms, so we can combine them easier.
There are 3 groups of like terms:
first group: , 5t, 7t
second group: , 6y, 9y,
third group : 8k,9k
5t+8k+6y+7t+9y+9k
7t+5t+6y+9y+9k+8k
7t+5t=12t
6y+9y=15y
9k+8k=17k
12t+15y+17k
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