**Решение:**
1) $$9b + 6b - 0,15 = 6,15$$
$$15b = 6,15 + 0,15$$
$$15b = 6,3$$
$$b = \frac{6,3}{15}$$
$$b = 0,42$$
**Ответ: b = 0,42**
2) $$17x - x + 5x - 1,9 = 17$$
$$21x = 17 + 1,9$$
$$21x = 18,9$$
$$x = \frac{18,9}{21}$$
$$x = 0,9$$
**Ответ: x = 0,9**
3) $$1,7x + 88,42 = 94,2$$
$$1,7x = 94,2 - 88,42$$
$$1,7x = 5,78$$
$$x = \frac{5,78}{1,7}$$
$$x = 3,4$$
**Ответ: x = 3,4**
4) $$16,4 - 5,4x = 14,78$$
$$-5,4x = 14,78 - 16,4$$
$$-5,4x = -1,62$$
$$x = \frac{-1,62}{-5,4}$$
$$x = 0,3$$
**Ответ: x = 0,3**
5) $$10,2x - 7,4x + 0,88 = 2$$
$$2,8x = 2 - 0,88$$
$$2,8x = 1,12$$
$$x = \frac{1,12}{2,8}$$
$$x = 0,4$$
**Ответ: x = 0,4**
6) $$0,6y + 0,18y - 2,376 = 5,58$$
$$0,78y = 5,58 + 2,376$$
$$0,78y = 7,956$$
$$y = \frac{7,956}{0,78}$$
$$y = 10,2$$
**Ответ: y = 10,2**