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-5+m=2m ; m-2m=5 ; -m=5/×(-1) ; m=-5
3n+n=8 ; 4n=8/:4 ; n=2
Zad2) a=[3m-1,2n+5] ; b=[4m+3,3-n] ;3×a-b=[4,-9]
a-b=3m-1-4m-3, 2n+5-3+n
a-b=-m-4,3n+2
3×[-m-4,3n+2]=[4,9]
-3m-12=4 ; -3m=16 ; m=-5i1/3
3n+2=9 ; 3n=7 ; n=2i1/3