Question 563823
Set it up this way:
Let n = the number:
{{{3(n+3) = n+11}}} Simplify.
{{{3n+9 = n+11}}} Subtract n from both sides.
{{{2n+9 = 11}}} Subtract 9 from both sides.
{{{2n = 2}}} Divide both sides by 2.
{{{n = 1}}}