Answer:
15j
Explanation:
I'm assuming 7] means 7j and to ignore the asterisk. The equation is in terms of j so you can just pay attention to the number before it, 7+7-9+10=15. But since it's in terms of j the answer is 15j
7j+7j-9j+10j
=14j-9j+10j
=5j+10j
=15j
i think the bracket was supposed to be a j
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