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1/2 z - z = -1 - 6
-1/2 z = -7 / -1/2
z = 14
y-3=9-y
y + y = 9 + 3
2y = 12 / :2
y = 6
y-3=9-y
0,5z+6=z-1/+1
y-3=9-y/-y
0,5z+7=z/-0,5z
-3=9-2y/-9
7=0,5z/*2
-12=2y/;2
14=z
-6=y