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-8z-7=-6 /+7
-8z=1
z=-1/8
-8z-7=-6 /+7
-8z=1 /:(-8)
z= -⅛
sprawdzenie:
-9z-7=-z-6
L= -9*(- ⅛)-7= 9/8 -7= 5 ⅞
P= ⅛-6= 5 ⅞
L=P