[latex] left { {{ frac{3a+1}{5} +frac{2b-1}{3} = frac{2}{5} } atop { frac{3a-2}{2} + frac{b-3}{4} =1}} ight. [/latex] срочнооооо

[latex]egin{cases}frac{3a+1}5+frac{2b-1}3=frac25;;;;;imes15\frac{3a-2}2+frac{b-3}4=1;;;;;;;imes4end{cases}Rightarrowegin{cases}9a+3+10b-5=6\6a-4+b-3=4end{cases}Rightarrow\Rightarrowegin{cases}9a+10(11-6a)=8\b=11-6aend{cases}\9a+10(11-6a)=8\9a+110-60a=8\51a=102\a=2\egin{cases}a=2\b=-1end{cases}[/latex]