a). 2x + 5 ≥ 7 + x
2x - x ≥ 7-5
x ≥ 2
x ∈ [2; +∞)
b). -7x -2 ≤ 26 - 4x
-7x + 4x ≤ 26 +2
-3x ≤ 28 | : (-3)
x≥ [tex] -\frac{28}{3} [/tex]
x ∈ [ [tex]- \frac{28}{3} [/tex] ; +∞)
c). 3(x-1) > 6 - 2(x +1)
3x -3 > 6 -2x - 2
3x -3 > 4 - 2x
3x + 2x > 4 +3
5x>7 |: 5
x> [tex] \frac{7}{5} [/tex]
x ∈ ([tex] \frac{7}{5} [/tex] ; +∞)
