3(х-7)+4=7х-1
3х-21+4=7х-1
3х-7х=21-4-1
-4х=16
х= - 4
ответ: -4
3(x-7)+4=7x-1
3x – 21 + 4 = 7x – 1
3x – 7x = – 1 – 4 + 21
-4x = 16
x=4
3(х-7)+4=7х-1
3х-21+4=7х-1
3х-7х=21-4-1
-4х=16
х= - 4
ответ: -4
3(x-7)+4=7x-1
3x – 21 + 4 = 7x – 1
3x – 7x = – 1 – 4 + 21
-4x = 16
x=4