Question

Помогите с уровнением по математике.
1. 6x-19= -x-10
2. 9(x-1)=x+15
3. 0,7-0,2x=0,3x-1,8
ДАЮ 30 БАЛЛОВ

Answer 1

Ответ:

$1)6x - 19 = - x - 10 \\ 6x + x = - 10 + 19 \\ 7x = 9 \\ x = \frac{9}{7} \\ x = 1 \frac{2}{7}$

$2)9(x - 1) = x + 15 \\ 9x - 9 = x + 15 \\ 9x - x = 15 + 9 \\ 8x = 24 \\ x = \frac{24}{8} \\ x = 3$

$3)0.7 - 0.2x = 0.3x - 1.8 \\ - 0.2x - 0.3x = - 1.8 - 0.7 \\ - 0.5x = - 2.5 \\ x = \frac{ - 2.5}{ - 0.5} \\ x = 5$