$$(3x + 5) + (8x + 1) = 17$$
$$3x + 5 + 8x + 1 = 17$$
$$11x + 6 = 17$$
$$11x = 17 - 6$$
$$11x = 11$$
$$x = 1$$
$$(3 - 5,8x) - (2,2x + 3) = 16$$
$$3 - 5,8x - 2,2x - 3 = 16$$
$$-8x = 16$$
$$x = -2$$
Ответ: 1) $$x = 1$$, 2) $$x = -2$$