12-2*(x+3)=26
12-2x-6=26
-2x=26-12+6
-2x=20 |* (-1)
2x=-20|: 2
x=-10
12-2(х+3)=26
-2(х+3)=14
х+3=14:(-2)
х=-7-3
х=-10.
12-2*(x+3)=26
12-2x-6=26
-2x=26-12+6
-2x=20 |* (-1)
2x=-20|: 2
x=-10
12-2(х+3)=26
-2(х+3)=14
х+3=14:(-2)
х=-7-3
х=-10.