Question 1184910
{{{RS=4y+2}}}
{{{ST=3y+9 }}}
{{{RT=11y-21}}}

{{{R}}}____________{{{S}}}_______________{{{T}}}

{{{RS+ST=RT}}}
{{{4y+2+3y+9=11y-21}}}
{{{7y+11=11y-21}}}
{{{21+11=11y-7y}}}
{{{32=4y}}}
{{{32/4=y}}}
{{{y=8}}}

{{{RS=4*8+2=34}}}
{{{ST=3*8+9=33 }}}
{{{RT=11*8-21=67}}}