{3m+2n=0,5, {2n+5n=4

[latex] left { {{3m+2n=0,5} atop {2m+5n=4}} ight. ; left { {{6m+4n=1} atop {2m+5n=4; |cdot (-3)}} ight. ; left { {{-11n=-11} atop {2m=4-5n}} ight. ; left { {{n=1} atop {m=-frac{1}{2}}} ight. [/latex]