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9z+11z-8z+z============

Răspuns :

9 z + 11 z - 8 z + z =
20 z - 8 z + z =
12 z + z = 13 z
[tex]9z+11z-8z+z= \\ \\= z(9+11-8+1)= \\ \\ =13z.[/tex]