-10y-64=-6y;
-10y+6y=64
-4y=64
y=-64:4
y=-16
16m-5=15m-10;
16m-15m=-10+5
m=-5
40-12x=20-11x;
-11x+12x=40-20
x=20
25-9y=5y+11;
5y+9y=25-11
14y=14
y=14:14
y=1
-5n-16=3n;
-5n-3n=16
-8n=16
n=-16:8
n=-2
63-8n=n;
n+8n=63
9n=63
n=63:9
n=7
18=3y+3
3y=18-3
3y=15
y=15:3
y=5