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x+8=4
x=4-8
x=-4
2)
x+2=7
x=7-2
x=5
3)
x-8 >=2
x>=2+8
x >= 10
4)
9-x <= 3
-x <= 3-9
-x <= -6 (-1)
x >= 6
5)
2x+4=12
2x=12-4
2x=8
x=8/2
x=4
6)
7x-4<=12
7x <= 12+4
7x <= 16
x<= 16/7
7)
x+10 >= 30
x >= 30-10
x >= 20
8)
3x-6 <=15
3x <=15+6
3x <=21
x <=21/3
x <= 7
9)
2x+9=19
2x=19-9
2x=10
x=10/2
x=5
10)
3x-20=2x+10
3x-2x=10+20
x=30
saludos