Question

e) x sobre 7 = 2(x+3) sobre 3

Answer 1

x/7 = (x + 3)/3

3x = 7x + 7 * 3

3x = 7x + 21

3x - 7x = 21

- 4x = 21

x = 21/-4

Solución : 

x = - 21/4

Answer 2

x/7 = (x + 3)/3

3x = 7x + 7 * 3

3x = 7x + 21

3x - 7x = 21

- 4x = 21

x = 21/-4

Solución : 

x = - 21/4