Question

(×-5)/10+(1-2×)/5=(3-×)/4

Answer 1

$\frac{x-5}{10} + \frac{1-2x}{5} = \frac{3-x}{4}$

mmc(10,5,4)
10, 5, 4 | 2
  5, 5, 2 | 2
  5, 5, 1 | 5
  1, 1, 1 |

2 * 2 * 5 = 4 * 5 = 20

$\frac{2x-10}{20} + \frac{4-8x}{20} = \frac{15-5x}{20}$

denominadores iguais cancela

2x - 10 + 4 - 8x = 15 - 15x
2x - 8x + 15x = 15 + 10 - 4
9x = 21

$x = \frac{21}{9} = \frac{7}{3}$