3.414 Найдите корень уравнения: 1) 18n – 12n – 3n = 186; 2) 25a – 7a – 8a = 400; 3) 2x + 8x – x = 243; 4) 6y – y + 4y = 234.

Решим уравнения:

1. $$18n - 12n - 3n = 186$$$$3n = 186$$$$n = 186 : 3$$$$n = 62$$
2. $$25a - 7a - 8a = 400$$$$10a = 400$$$$a = 400 : 10$$$$a = 40$$
3. $$2x + 8x - x = 243$$$$9x = 243$$$$x = 243 : 9$$$$x = 27$$
4. $$6y - y + 4y = 234$$$$9y = 234$$$$y = 234 : 9$$$$y = 26$$

Ответ: 1) n = 62; 2) a = 40; 3) x = 27; 4) y = 26