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x= -3
-7y= 56 /:(-7)
y= -8
13m= -65 /:13
m= -5
15k= -60 /:15
k= -4
-9x= -45 /:(-9)
x= 5
-20s= -180 /:(-20)
s= 9
-u= 8 /:(-1)
u= -8
-z= -17 /:(-1)
z= 17
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