7x + 9 ≥ 2(x-4)+1
4x+2 ≤ 41 - 3(7+x)
1) 7x + 9 ≥ 2(x-4) +1
7x +9 ≥ 2x - 8 + 1
7x + 9 ≥ 2x - 7
7x + 9 - 2x +7 ≥ 0
5x +16 ≥ 0
5x ≥ 16
x ≥ 16/5
x ≥ 3,2
2) 4x +2 ≤ 41 - 3(7+x)
4x + 2 ≤ 41 - 21 + 7x
4x + 2 ≤ 20 + 7x
4x - 7x ≤ 20 - 2
-3x ≤ 18
x ≥ -6
