Solve by Substitution
{
x
+
6
y
=
−
30
4
x
−
7
y
=
4
\displaystyle {\left\lbrace\begin{array}{ccccc} {x}&+&{6}{y}&=&-{30}\\{4}{x}&-&{7}{y}&=&{4}\end{array}\right.}
{
x
4
x
+
−
6
y
7
y
=
=
−
30
4
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