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c. 2z= z+5
d. x=1kg
e. 2y= 10kg
f. 2z+1kg=z+6kg
2y=15
y=15/2
y=7.5
C. 2z=z+5
z=5
D.x=1
E.2y=10
y=10/2
y=5
f.2z+1=z+1+5
z=5+1-1
z=5