Solve the system
{
−
x
+
y
=
0
−
3
x
−
3
y
=
−
30
\displaystyle {\left\lbrace\begin{array}{ccc} -{x}+{y}&=&{0}\\-{3}{x}-{3}{y}&=&-{30}\end{array}\right.}
{
−
x
+
y
−
3
x
−
3
y
=
=
0
−
30
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