а) 15x – 8x = 21
7x = 21
x = 21/7
х=3
б) 2x + 4x = 30
6x = 30
x = 30/6
х=5
в) 4y + 2y – y = 20
5y = 20
y = 4
г) 7y + y – 2y = 24
6y = 24
д) 3x – x = 12
2x = 12
x = 12/2
х=6
е) x + 8x = 72
9х = 72
х = 72/9
х=8
ж) 9x + x – 9x = 5
x = 5
з) 4x + 3x –7x = 6
0x = 6
уравнение решений не имеет
а) 15x – 8x = 21
7x = 21
x = 21/7
х=3
б) 2x + 4x = 30
6x = 30
x = 30/6
х=5
в) 4y + 2y – y = 20
5y = 20
y = 4
г) 7y + y – 2y = 24
6y = 24
y = 4
д) 3x – x = 12
2x = 12
x = 12/2
х=6
е) x + 8x = 72
9х = 72
х = 72/9
х=8
ж) 9x + x – 9x = 5
x = 5
з) 4x + 3x –7x = 6
0x = 6
уравнение решений не имеет