1. -10y-64=-6y; -10y+6y=64; -4y=64; y=64/(-4)=-16;2. 9m-8=6m+7; 9m-6m=8+7; 3m=15; m=15/3=5;3. 6x+10=5x+15; 6x-5x=15-10; x=5;4. 16m-5=15m-10; 16m-15m=5-10; m=-5;5. 8-5n=10-4n; 4n-5n=10-8; -n=2; n=-2;6. 18=3y+3; 18-3=3y; 15=3y; y=15/3=5;7. 40-12x=20-11x; 40-20=12x-11x; x=20;8. -5n-16=3n; 3n+5n=-16; 8n=-16; n=-16/8=-2;9. 25=5y-5; 5y=25+5; 5y=30; y=30/5=6;10. 25-9y=5y+11; 25-11=5y+9y; 14=14y; y=14/14=1;11. 63-8n=n; 63=n+8n; 9n=63; n=63/9=9;12. 28-9m=-8-10m; 28+8=9m-10m; 36=-m; m=-36;13. 4y+7=5y+4; 4y-5y=4-7; -y=-3; y=3;14. 56-9n=-5n; 56=9n-5n; 56=4n; n=56/4=14