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4x - 5 - 7x = 2 - 5x - 23
-3x + 5x= - 21 + 5
2x = - 18 |:2
x = -9
d).
4x - 5 + 2x = 4 - 7x + 31
6x + 7x = 35 + 5
13x = 40 | : 13
x = 3,1 (wynik podaje w przybliżeniu)
e).
3x - 15 > 5x - 33
3x - 5x > - 33 + 15
- 2x > -18 |: (-2)
x < 9
f).
5x - 7 ≥ 8x + 11
5x - 8x ≥ 11 + 7
-3x ≥ 18 |: (-3)
x ≤ -6
g).
6x + 7 - 7x > 2 - 4x - 17
-x + 4x > -15 - 7
3x > -22 | :3
x > 7,3
h) .
-4x - 11 + 3x ≤ 3 - 2x - 24
-x +2x ≤ -21 +11
x ≤ -10