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2k = 11 - 3
2k = 8
k = 4
2.-7z=3z-30
-7z-3z=-30
-10z=-30
z= 3
3.4d+6=d
4d-d=6
3d=6
d=2
4.6m-2=2m-8
6m-2m=-8+2
4m=-6
m= -6/4= -3/2
5.3m+4=22
3m=22-4
3m=18
m=6