Question 1098749
1.{{{2E+S=383}}}
2.{{{3E+2S=646}}}
Multiply eq. 1 by 2 and subtract from eq. 2,
{{{3E+2S-4E-2S=646-766}}}
{{{-E=-120}}}
{{{E=120}}}
Now use either equation to solve for S.