Solve by Substitution or Elimination
{
5
x
−
5
y
=
25
−
10
x
+
10
y
=
−
50
\displaystyle {\left\lbrace\begin{array}{ccccc} {5}{x}&-&{5}{y}&=&{25}\\-{10}{x}&+&{10}{y}&=&-{50}\end{array}\right.}
{
5
x
−
10
x
−
+
5
y
10
y
=
=
25
−
50
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