Question 884456
 {{{ 7x+5y=-20}}}
{{{    x=1-2y}}}
Substituting,
{{{7(1-2y)+5y=-20}}}
{{{7-14y+5y=-20}}}
{{{-9y=-27}}}
{{{highlight(y=3)}}}
Then,
{{{x=1-2(3)}}}
{{{x=1-6}}}
{{{highlight(x=-5)}}}