1)0,4у-6=12
0,4у=12+6
0,4у=18
у=18/0,4
у=45
2)х+6=5+4х
x – 4x = 5 – 6
-3x = -1
x = -1/-3
х=0,33333333333
3)13-3(х+1)=4-5х
13 – 3x – 3 = 4 – 5x
– 3x + 5x = 4 + 3 – 13
2x = -6
x = -3
4)0,2(3х-5)-0,3(х-1)=-0,7
0.6x – 1 – 0.3x + 0.3 = – 0.7
0,6x – 0,3x = – 0,7 – 0,3 + 1
x = 0
5)1,2(5-4х)=-6(0,8х+1)
6 – 4.8x = – 4.8x – 6
– 4,8x + 4,8x = – 6 – 6
0x = -12
уравнение решений не имеет
1)0,4у-6=12
0,4у=12+6
0,4у=18
у=18/0,4
у=45
2)х+6=5+4х
x – 4x = 5 – 6
-3x = -1
x = -1/-3
х=0,33333333333
3)13-3(х+1)=4-5х
13 – 3x – 3 = 4 – 5x
– 3x + 5x = 4 + 3 – 13
2x = -6
x = -3
4)0,2(3х-5)-0,3(х-1)=-0,7
0.6x – 1 – 0.3x + 0.3 = – 0.7
0,6x – 0,3x = – 0,7 – 0,3 + 1
x = 0
5)1,2(5-4х)=-6(0,8х+1)
6 – 4.8x = – 4.8x – 6
– 4,8x + 4,8x = – 6 – 6
0x = -12
уравнение решений не имеет