Question 29429
{{{(3/5)*(n +1) -n/2 = 3}}}
multiply both sides by 10
{{{2*3*(n+1) - 5*n = 30}}}
{{{6*n + 6 -5*n = 30}}}
{{{n = 24}}}
{{{n+1 = 25}}}
check
{{{(3/5)*(24 +1) -24/2 = 3}}}
{{{15 - 12 = 3}}}
OK