[mat]\left { {{12%ś+2%m=3%*200} \atop {ś+m=200}} \right.[/mat]
[mat]\left { {{12%ś+2%m=3%200} \atop {ś=200-m}} \right.[/mat]
[mat]\left { {{0,12(200-m)+0,02m=0,03200} \atop {ś=200-m}} \right.[/mat]
[mat]\left { {{24-0,12m+0,02m=6} \atop {ś=200-m}} \right.[/mat]
[mat]\left { {{-0,10m=-18} \atop {ś=200-m}} \right.[/mat]
[mat]\left { {{m=180} \atop {ś=200-180}} \right.[/mat]
[mat]\left { {{m=180} \atop {ś=20}} \right.[/mat]