Question 253856
{{{(1/3)s + 7/9 = (4/3)s }}}
{{{(1/3)s = -7/9 + (4/3)s}}} 
{{{(1/3)s - (4/3)s = -7/9}}}
multiply by 9 to get
{{{3s - 12s = -7}}}
{{{-9s = -7}}}
{{{s=7/9}}}