Question

Помогите решить уравнения :
1) 5 (n-8)-3 (4-2n)=7 (3n-7)+9
2)1,7k-0,3 (k-5)=2,8-0,1 (k+4)

Answer 1

$5n - 40 - 12 + 6n = 21n - 49 + 9 \\ - 10n = 12 \\ n = - \frac{6}{5} = - 1.2$
$1.7k - 0.3k + 1.5 = 2.8 - 0.1k - 0.4 \\ 1.5k = 0.9 \\ k = 0.6$

Answer 2

$5 (n-8)-3 (4-2n)=7 (3n-7)+9\\5n-40-12+6n=21n-49+9\\11n-21n=52-49+9\\-10n=12\\n=-1.2$
Ответ: $-1.2$

$1.7k-0.3 (k-5)=2.8-0.1 (k+4)\\1.7k-0.3k+1.5=2.8-0.1k-0.4\\1.5k=2.8-1.5-0.4\\1.5k=0.9\\k=0.6$
Ответ: $0.6$