I want to say A bit that's probably not right. try it
The pictures a bit blurry but if I’m reading it correctly I believe it’s 8. My picture isn’t the best but I hope it helps
First distribute 3(8-6n):
3(8 - 6n) = 42
24 - 18n = 42
Now subtract 24 from both sides:
-18n = 18
And divide both sides by -18 to finally isolate n:
n = -1