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Anonymous
23+n+5+n=
23+5+n+n=
28+2n
It depends what n is, once, you find out what n is equal to, plug it in to the equation above in bold.
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n = 3
n + 5 = 18 n = 13
5
*
n + 2 = 5, solve for n.n = 5 - 2n = 3