2x+7=5x+13
2х-5х=13-7
-3х=6
х=6/(-3)
х=-2
3x-23=19-4x
3х+4х=19+23
7х=42
х=42/7
х=6
1,3x+4,8=2,9x-7,2
1,3х-2,9х=-7,2-4,8
-1,6х=-12
х=-12/(-1,6)
х=7,5
4/7x+1 3/7=6/7x-5 5/7*7
4/7х+1 3/7=6/7х-40
4/7х-6/7х=-40-1 3/7
-2/7х=-290/7
х=-290/7:(-2/7)
х=145
2(x-3)-4(x+1)=5x-38
2х-6-4х-4=5х-38
-2х-10=5х-38
-2х-5х=-38+10
-7х=-28
х=-28/(-7)
х=4
