Question 980316
{{{125=5^3}}}
So,
{{{125^x=5^4}}}
Substituting,
{{{(5^3)^x=5^4}}}
{{{5^(3x)=5^4}}}
{{{3x=4}}}
{{{x=4/3}}}
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Similarly,
{{{16=2^4}}}
{{{16^(n+3)=2^3}}}
{{{(2^4)^(n+3)=2^3}}}
{{{2^(4(n+3))=2^3}}}
{{{4(n+3)=3}}}
{{{n+3=3/4}}}
{{{n=3/4-12/3}}}
{{{n=-9/4}}}