Oh, dude, twice n is just like if you take n and double it. So, if n is 5, twice n would be 10. It's basically just adding n to itself once. Easy peasy, right?
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2*(15 + N)
if you mean 2n=8, then N=4, which translate to 2x4=8
n = number 2(n + 15) ======
2(7+5)=n 2(12)=n 24=n but its an opposite n, so the answer is -24
It is twice as great.