solve the following equation:
log10n+log10(n-3)=1
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log10n+log10(n-3)=1
log10{n(n-3)}=10log10
n(n-3)=10
5(5-3)=10
so
n=5
log10{n(n-3)}=10log10
n(n-3)=10
5(5-3)=10
so
n=5
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