{x-y=7 {x-y=7
{xy=-10 {xy=-12
{x-y=7 {x=7+y
{xy=-10 {(7+y)y=-10
{x=7+y
{7y+y^2=-10
// y^2+7y+10=0
D=49-40=9
y1=(-7-3)/2=-5
y2=(-7+3)/2=-2
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