Question 1166762
x, Kim
y, Kevin

{{{system(x+y=18,x+3=2(y+3))}}}

-

{{{system(x+y=18,x+3=2y+6)}}}

{{{system(x-2y=3,x+y=18)}}}


{{{highlight(y=5)}}}
and
{{{highlight(x=13)}}}