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k/7=n
b)a=k+6
a-6=k
c)z =7-y
z-7=-y______/:(-1)
-z+7=y
k=7n obustronnie :7
n=k/7
b)a=k+6 ;wyznacz k
a=k+6 obustronnie -6
k=a-6
c)z =7-y ;wyznacz y
z=7-y obustronnie +y
z+y=7 obustronnie -z
y=7-z