1) 2x+13=3(x+2)
2x+13=3x+6
13-6=3x-2x
x=7
2) a+a+1+a+2 totul supra 3=23 Il amplificam pe 23 cu 3
a+a+1+a+2=69
3a+3=69
3a=66=> a=22
a+1( adica nr. din mijloc)=22+1=23
3) 4esarfe...........320lei
3esarfe..............xlei
4x=320×3
4x=960=> x=240lei
4) [3×(x+19)]:3>_31
3×(x+19)>_93
x+19>_31
x>_12=> x={12,11,10.....0} Cel mai mic fiind 0.
