svetazuna 1.
3х-1=2х-4,
3х-2х=-4+1,
х=-3,

2.
3х+15=7-5х,
3х+5х=7-15,
8х=-8,
х=-1,

3.
19у-171=3у+21,
19у-3у=21+171,
16у=192,
у=12,

4.
4х-36=3х-24,
4х-3х=-24+36,
х=12,

5.
6х-27=5х-20,
6х-5х=-20+27,
х=7,

6.
21-14х=15-15х,
-14х+15х=15-21,
х=-6

jekadva 1)
3x-1=2x-4
3x-2x=-4+1
x=-3

2)
3x+15=7-5x
3x+5x=7-15
8x=-8
x=-8:8
x=-1

3)
19y-171=3y+21
19y-3y=21+171
16y=192
y=192:16
y=12

4)

4x-36=3x-24
4x-3x=-24+36
x=12

5)
6x-27=5x-20
6x-5x=-20+27
x=7

6)
21-14x=15-15x
-14x+15x=15-21
x=-6