Решите уравнение 2n+7n-12=69

Question

Решите уравнение 2n+7n-12=69

Answer 1

2n+7n-12=69 9n-12=69 9n=69+12 9n= 81 n = 81:9 n = 9

Answer 2

2n+7n-12=69
2n+7n=69+12
2n+7n=81
n=81:9n
n=9
Ответ: 9