Răspuns :
a) 4(x+1) + 3(x+1) <= 42
4x + 4 + 3x + 3 <= 42
7x + 7 <= 42
7x < = 35
x <= 5
b) (4x+x) / 5 <= 3
5x / 5 <= 3
x <= 3
c) 2(x+2) + 4(x+1) - 6 <= 20
2x + 4 + 4x + 4 - 6 <= 20
6x + 2 <= 20
6x <= 18
x <= 3
d) 7x - 3 <= 5x + 11
2x <= 14
x <= 7
e) 18x / 2 <= 9
9x <= 9
x <= 1
f) 25x + 15 - 18x < 3(x+7) + 2x
7x + 15 < 3x + 21 + 2x
2x < 6
x < 3
4x + 4 + 3x + 3 <= 42
7x + 7 <= 42
7x < = 35
x <= 5
b) (4x+x) / 5 <= 3
5x / 5 <= 3
x <= 3
c) 2(x+2) + 4(x+1) - 6 <= 20
2x + 4 + 4x + 4 - 6 <= 20
6x + 2 <= 20
6x <= 18
x <= 3
d) 7x - 3 <= 5x + 11
2x <= 14
x <= 7
e) 18x / 2 <= 9
9x <= 9
x <= 1
f) 25x + 15 - 18x < 3(x+7) + 2x
7x + 15 < 3x + 21 + 2x
2x < 6
x < 3