rozumiem że masz rozwiązać ten układ równań
\left \{ {{2x-2y=-1} \atop {3x+2y=26}} \right.
\left \{ {{-2y=-1-2x} \atop {3x+2y=26}} \right.
\left \{ {{y=\frac{-1-2x}{-2}} \atop {3x+2y=26}} \right.
\left \{ {{y=\frac{1+2x}{2}} \atop {3x+2(\frac{1+2x}{2})=26}} \right.
\left \{ {{y=\frac{1+2x}{2}} \atop {3x+2(\frac{1+2x}{2})=26}} \right.
\left \{ {{y=\frac{1+2x}{2}} \atop {3x+1+2x=26}} \right.
\left \{ {{y=\frac{1+2x}{2}} \atop {5x=25}} \right.
\left \{ {{y=\frac{1+2x}{2}} \atop {x=5}} \right.
\left \{ {{y=\frac{1+2*5}{2}} \atop {x=5}} \right.
\left \{ {{y=\frac{11}{2}} \atop {x=5}} \right.