Respuestas
1) 6x - 3 < 12
6x - 3 + 3 < 12 + 3
6x < 15
6x/6 < 15/6
x < 5/2
2 ) 3x + 12 > 11
3x + 12 - 12 > 11 - 12
3x > -1
3x / 3 > -1/3
x > -1/3
3) x + 2
--------- < 5
4
4(x + 2)
------------ < 5 . 4
4
x + 2 < 20
x + 2 - 2 < 20 - 2
x < 18
4) x - 8
--------- < 5
9
9 (x - 8)
------------ < 5 . 9
9
x - 8 < 45
x - 8 + 8 < 45 + 8
x < 53
5) x + 5 x - 7
--------- + --------- < 7
3 9
x + 5 x - 7
--------- . 3 + --------- . 3 < 7 . 3
3 9
2x - 2 < 21
2x - 2 + 2 < 21 + 2
2x < 23
2x/2 < 23/2
x < 23/2
6) x - 8 x + 5
--------- + --------- < 13
6 4
x - 8 x + 5
--------- . 12 + --------- . 12 < 13 . 12
6 4
2( x - 8) + 3 (x + 5) < 156
2x - 16 + 3x + 15 < 156
5x - 1 < 156
5x - 1 + 1 < 156 + 1
5x < 157
5x/5 < 157/5
x < 157/5