Răspuns:
a) x+6x-2<12
7x<14|:7
x<2
x€{0,1}
b)5x+5+2x+2<42
7x+7<42|:7
x+1<6
x<5
x€{0,1,2,3,4}
c)5x:5<2
x<2
x€{0,1}
d) 4x:2<6
2x<6
x<3
x€{0,1,2}
e)4x+8+2x+2-10<30
6x<30
x<5
x€{0,1,2,3,4}
f)2x+10+3x-5<45
5x+5<45|:5
x+1<9
x<8
x€{0,1,2,3,4,5,6,7}
g)13x-6x+2x+14<14
9x+14<14
9x<0
x€(multimea nula-nu am semn pe tastatura)