28 + N = 68
Subtract 28 from each side:
N = 40
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-53+n = -28 n = -28+53 n = 25
n = 7. 3(7) + 7 = 28. 21+7=28
90
23+n+5+n=23+5+n+n=28+2nIt depends what n is, once, you find out what n is equal to, plug it in to the equation above in bold.
N=0