Răspuns:
Explicație pas cu pas:
a) 10x-4 < 7x-16
3x < -12 , x < -12/3 = -4, x < -4
x in (-inf, ...-7, -6, -5)
b) 6x+21 > 8x+11
-2x > 11-21 = -11 |*-1
2x < 11, x < 11/2
x in (-inf, ...-2, -1, 0, 1, 2, 3, 4)
c) 30-15x < 12-9x
-6x < -18 |*-1
6x > 18, x > 3
x in (4, 5, 6,...+inf)
etc.