2x+1=2001
2x=2001-1
2x=2000
x=2000÷2
x=1000
10+5x=200
5x=200-10
x=190÷5
x=38
2x+7=201
2x=201-7
x=192÷2
x=96
110-5x=30
5x=110-30
x=80÷5
x=16
14x-28=140
14x=140-28
x=112÷14
x=8
3x-9=18
3x=18+9
x=27÷3
x=9
120+5x=2000
5x=2000-120
x=1880÷5
x=376
x+5=5
x=5-5
x=0