а) 5x + 2x = 847x = 84x = 84 / 7x = 12
б) 12x - 4x = 32488x = 3248x = 3248 / 8x = 406
в) 17y - y = 161616y = 1616y = 1616 / 16y = 101
г) у + 19у = 404020у = 4040y = 4040 / 20y = 202
а) 5x + 2x = 84
7x = 84
x = 84 / 7
x = 12
б) 12x - 4x = 3248
8x = 3248
x = 3248 / 8
x = 406
в) 17y - y = 1616
16y = 1616
y = 1616 / 16
y = 101
г) у + 19у = 4040
20у = 4040
y = 4040 / 20
y = 202