1) 3-(2/9m+1/6)=m/3+15
3-(4/18m+3/18)=6m/18+15
54-(4m+3)=6m+270
54-4m-3=6m+270
6m-4m=270+3-54
2m=219
m=219:2
m=109.5
2) 2.6z-0.2(3z-9)=0.5(2z-6)
2.6z-0.6z+1.8=z-3
2.6z-0.6z-z=1.8-3
z=-1.2
3) 5/12(с-3)-1/6(2с-7)=2
5/12(с-3)-2/12(2с-7)=2
5(12с-36)-1(24с-84)=24
60с-180-24с+84=24
60с-24с=24-84+180
36с=120
с=120:36
с=120/36=3 12/36=3 1/3