1/9{7【1/5（x+4）+1】-5}=1 （4x-7）/5-（5x-4）/2=（14-x）/4

数学之美团为你解答
1/9{7 [1/5（x+4）+]-5}=1
7 [ 1/5（x+4）+1 ] - 5 = 9
1/5（x+4）+1 = 2
x+4 = 5
x = 1
(4x - 7)/5 - (5x-4)/2 = (14 - x)/4
同乘以 20
4(4x-7) - 10(5x-4) = 5(14-x)
16x - 28 - 50x + 40 = 70 - 5x
- 29x = 58
x = - 2