\frac{1-5}{2}=-2\\ \left \{{{
x=1}\atop{y=-2}}\right.\\ Answer: (1;-2) " alt="\left \{{{3x-2y=7}\atop{5x+2y=1}} \right.\\ +\left\{{{3x-2y=7}\atop{5x+2y=1}}\right.\\ 3x+5x-2y+2y=7+1\\ 8x=8\\ x=1\\ y=\frac{1-5x}{2}=\big[x=1 \big]=
\frac{1-5}{2}=-2\\ \left \{{{
x=1}\atop{y=-2}}\right.\\ Answer: (1;-2) " align="absmiddle" class="latex-formula">