Answer: -18
Step-by-step explanation:
The answer is - 18 because, -15+9=-6 and -6-12=-18
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Hopes this helps
x = 9
60 + 6x + 16 = 13x + 13
6x - 13x = 13 - 16 - 60
- 7x = - 63
- x = - 63/7
- x = - 9
9 hours