Question 972099
{{{3=A[1]}}} and {{{2*(8/2)(3+A[1]+(8-1)d)=(5/2)(3+A[1]+(5-1)d)}}}----this is just an exact transcription of the worded description, using formula for sum of arithmetic sequence.


{{{8(3+3+7d)=(5/2)(3+3+4d)}}}
{{{8(6+7d)=(5/2)(6+4d)}}}
{{{8*6+8*7d=15+10d}}}
{{{48+46d=15}}}
{{{46d=15-48}}}
{{{46d=-33}}}
{{{highlight(d=-33/46)}}}