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a 6x-z-y
b 9y-6z+1+z
nnnnniiiiiiieeeeemmmmaaaa ttttrrrruuuudddnnniiieeejjjssssszzzzzyyyyyccccchhhhh??????????
-8y-4z+x-y-2z+1=-9y-6z+x+1
b)-7-2z+x-y= -7 - x - y - 2z
Nie jestem pewna^