240. Решите уравнение:

1) 12x - 5x = 3,192 => 7x = 3,192 => x = 0,456
2) 7x + 5x + 0,28 = 9,1 => 12x = 8,82 => x = 0,735
3) 6x - 14,7 = 22,05 => 6x = 36,75 => x = 6,125
4) 7,48 - 16x = 2,68 => 16x = 4,8 => x = 0,3