a)

1.

12x-3(x+1)≤2(x+1)

12x-3x-3≤2x+2

9x-3≤2x+2

9x-2x≤2+3

7x≤5

2.

x2-3x+5x-15+41≥-12x+36

2x+26≥-12+36

2x+12x≥36-26

14x≥10

{x≤5/7

{x≥5/7

x=5/7

b)

1.

2x-1-2(4-x)>3

2x-1-8+2x>3

4x-9>3

4x>3+9

4x>12

2.

3(x-1)<2(2-x)+3

3x-3<4-2x-3

3x-3<7-2x

3x+2x<7+3

5x<10

{x>3

{x<2

1.

2√6-2x+6/x2-16

2√6-2x*(x2-16)+6/x2-16