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m=19/4.
* 2y+8=40/-8
2y=40-8/2
y=16
*-9+3z=18/+9
3z=27/3
z=9
*n/2-16=1/*2
n-32=2/+32
n=34
*3p+2=32/-2
3p=30/3
p=10 .