Question

0,3x-0,8+5=x-4 решите уравнение

Answer 1

$4.2 + 4 = 0.7x \\ 8.2 = 0.7x \\ x = \frac{82}{10} \times \frac{10}{7} = \frac{82}{7} = 11 \frac{5}{7}$

-0,8+5+4=х-0,3х
8,2=0,7х
х=8,2/0,7=82/10 : 7/10 = 82/10 × 10/7 = 82/7= 11 5/7