N=19.
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10n = 1,000,000 n= 1,000,000 divide by 10 n= 100,000
m=10 n=-2 10m-1n-5= 10(10)-1(-2)-5= 100+2-5= 97
5n-25 = 10 5n = 10+25 5n = 35 n = 7
If: n squared -n -90 = 0 Then the solutions are: n = 10 or n = -9
your expression is this... n+5=3+12 n+5=15 n=10