СРОЧНО!!! х/12 - х/21 = 7/4

Question

СРОЧНО!!!

х/12 - х/21 = 7/4

Answer 1

x/12-x/21=7/4

7x/84-4x/84=147/84

3x/84=147/84

3x=147

x=49

Answer 2

x/12 - x/21 = 7/4 домнножим на 84

7x - 4x = 147

3x = 147

x = 49