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15-3*k=3
-3k=3-15
-3k=-12 /:(-3)
k=4
b)
1/2*z=27 /*2
z=54
c)
2/3*s-6=24
2/3s=24+6
2/3s=30 /*3/2
s=30*3/2
s=90/2
s=45