3Х-15=х+3 7-3х=х+11 2(х+3)=х+13 4(5-х)=3х-1
1) 3х-15=х+3
2х=18
х=9
2) 7-3х=х+11
-4х=4
х=-1
3) 2*(х+3)=х+13
2х+6=х+13
х=7
4) 4(5-х)=3х-1
20-4х=3х-1
21=7х
х=3
3х-15=х+3 7-3х=х+11 2(х+3)=х+13 4(5-х)=3х=1
2х=18 2х=4 2х+6=х+13 20-4х=3х-1
х=9 х=2 х=7 21=7х