[mat]x[/mat] - ilość solanki [mat]2%[/mat]
[mat]y[/mat] - ilość solanki [mat]5%[/mat]
[mat]\left { {{x+y=12} \atop {2%*x+5%*y=4%*12}} \right.[/mat]
[mat]\left { {{x=12-y} \atop {0,02x+0,05y=0,04*12}} \right.[/mat]
[mat]\left { {{x=12-y} \atop {0,02*(12-y)+0,05*y=0,48}} \right.[/mat]
[mat]\left { {{x=12-y} \atop {0,24-0,02y+0,05y=0,48}} \right.[/mat]
[mat]\left { {{x=12-y} \atop {0,24+0,03*y=0,48}} \right.[/mat]
[mat]\left { {{x=12-y} \atop {0,03*y=0,48-0,24}} \right.[/mat]
[mat]\left { {{x=12-y} \atop {0,03*y=0,24}} \right.[/mat]
[mat]\left { {{x=12-y} \atop {y=8}} \right.[/mat]
[mat]\left { {{x=12-8} \atop {y=8}} \right.[/mat]
[mat]\left { {{x=4} \atop {y=8}} \right.[/mat]