Решение:
a) $$53x - 28x - 24 = 251$$
$$25x - 24 = 251$$
$$25x = 251 + 24$$
$$25x = 275$$
$$x = \frac{275}{25}$$
$$x = 11$$
б) $$(17x - 3x) : 17 = 364$$
$$14x : 17 = 364$$
$$\frac{14x}{17} = 364$$
$$14x = 364 * 17$$
$$14x = 6188$$
$$x = \frac{6188}{14}$$
$$x = 442$$
Ответ:
a) $$x = 11$$
б) $$x = 442$$