1) 12-(х-2)=3
12 – x + 2 = 3
– x = 3 – 2 – 12
-x = -11
x = 11
2)7(3х+1)=-14
21x + 7 = – 14
21x = – 14 – 7
21x = -21
x = -1
3)-2(х-3)+(4-х)=12
– 2x + 6 + 4 – x = 12
– 2x – x = 12 – 4 – 6
-3x = 2
x = 2/-3
х=-0,66666666666
4)7(х-4)+3=3(2х-7)+х-8
7x – 28 + 3 = 6x – 21 + x – 8
7x – 6x – x = – 8 – 21 – 3 + 28
0x = -4
уравнение решений не имеет
1) 12-(х-2)=3
12 – x + 2 = 3
– x = 3 – 2 – 12
-x = -11
x = 11
2)7(3х+1)=-14
21x + 7 = – 14
21x = – 14 – 7
21x = -21
x = -1
3)-2(х-3)+(4-х)=12
– 2x + 6 + 4 – x = 12
– 2x – x = 12 – 4 – 6
-3x = 2
x = 2/-3
х=-0,66666666666
4)7(х-4)+3=3(2х-7)+х-8
7x – 28 + 3 = 6x – 21 + x – 8
7x – 6x – x = – 8 – 21 – 3 + 28
0x = -4
уравнение решений не имеет