Răspuns :
1/5 (2x-1)=4x
2x/5 - 1/5 = 4x /*5
2x - 1 = 20x
2x - 20x = 1
- 18x = 1
x = - 1/18
2x/5 - 1/5 = 4x /*5
2x - 1 = 20x
2x - 20x = 1
- 18x = 1
x = - 1/18
[tex] \frac{1}{5} (2x - 1) = 4x \\ \\ 5 \times \frac{1}{5} (2x - 1) = 5 \times 4x \\ 2x - 1 = 20x \\ 2x = 20x + 1 \\ 2x - 20x = 1 \\ - 18x = 1 \\ x = - \frac{1}{18} [/tex]