7x-8=5x-1,6; 7х-5х=8-1,6; 2х=6,4; х=2,3
9x-12=8x+4; 9х-8х=12+4; х=16
-8a+8=-9a-2; 9а-8а=-8-2; а=-10
2m+1=3m+9; 2m-3m=9-1; -m=8; m=-8
-42n-3=51n-3; -42n-51n=3-3; -93n=0; n=0
4+28y=6+26y; 28y-26y=6-4; 2y=2; y=1
16-5z=17-6z; 6z-5z=17-16; z=1
9k+7=-3+10k; 9k-10k=-3-7; -k=-10; k=10
6-12c=8-13c; 13с-12с=8-6; с=2
0,9x+3=0,6x; 0,9х-0,6х=-3; 0,3х=-3; х=-0,1