Question

Х+9/20=3/4
Х25/36-х=5/18.

Answer 1

Ответ:

х+9/20=3/4

х=3/4-9/20

х=15/20-9/20

х=6/20=3/10

25/36-х=5/18

25/36-х=10/36

х=(25-10)/36

х=15/36=5/12

Answer 2

$x + \frac{9}{20} = \frac{3}{4} \\ x = \frac{3}{4} - \frac{9}{20} \\ x = \frac{15}{20} - \frac{9}{20} \\ x = \frac{6}{20} = \frac{3}{10}$

$\frac{25}{36} - x = \frac{5}{18} \\ \frac{25}{36} - x = \frac{10}{36} \\ x = \frac{(25 - 10)}{36} \\ x = \frac{15}{36} = \frac{5}{12}$