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4X+2X-3X
15a -a -5a
9z+11z-8z+z
10m+3m-9m


Răspuns :

4x+2x-3x=6x-3x=4x;
15a-a-5a=14a-5a=9a;
9z+11z-8z+z=20z-7z=13z;
10m+3m-9m=13m-9m=4m;