1. 3x≤27 =>x≤9 =>raspunsul a) si c)
2. a)4x=8 =>x=2
b)7x≤14 =>x≤2 =>solutiile sunt 0,1,2.
3. x+3x=3²+3³
4x=9+27
4x=36 =>x=9
4. 18x+24+15=201
18x=201-39
18x=162 =>x=9
5. x-distanta parcursa
x+x+10+x+20+x+30=120
4x=120-60
4x=60 =>x=15km in prima zi, 25km in a doua zi, 35km in a treia zi, 45km in a patra zi.
6. 2·[1+5·(30-2·5)]-5x=97
2·(1+5·20)=5x+97
2·101=5x+97
202-97=5x
105=5x =>x=21
