Question

Halla el valor de x en las siguientes ecuaciones:

A.9x - 5 ( 2 - x ) = 4

B.-3x + 4 ( 6x - 7 ) = -7

Answer 1

Resolvemos.

9x - 5 (2x - x) = 4

9x - 10x + 5x = 4

4x = 4

  x = 4/4

  x = 1

......................................

- 3x + 4(6x - 7) = - 7

- 3x + 24x - 28 = - 7

- 27x = - 7 + 28

- 27x = 21
 
     x = - 21:3/27:3

     x = - 7/9