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a) 7z-8=-y+24
7z+y=24+8
7z+y=32
y=32-7z
7z+32-7z=32
32=32
b) -2m+7=m-6
-2m-m=-6-7
-3m=-13 /:(-3)
m=13/3
c) -5t+1=8-6t
-5t+6t=8-1
t=7