ochernigowskaia 1)14x-21=3x+12
14x-3x=21+12
11x=33
x=3
2)-4x+34=-2x+10
4x-2x=34-10
2x=24
x=12
3)-5x+12x-12=2
7x=14
x=2
4)2x+16=-6x+48
2x+6x=48-16
8x=32
x=4
5)6-2x-x+3=6
-3x=-3
x=1