Verified answer

[tex]\displaystyle\bf\\+\left \{ {{7x-12y=14} \atop {3x+12y=36}} \right. \\----------\\10x=50\\\\x=50:10\\\\x=5\\\\12y=36-3x=36-3\cdot 5=36-15=21\\\\y=21:12=1,75\\\\y=1,75\\\\Otvet: \ \Big (5 \ ; \ 1,75\Big)[/tex]