Question

 Resolva as equações:

A)  13(2x – 3) – 5(2 . x) = 5(-3 + 6x) 

B)  2(2x + 7) + 3(3 – 5) 3 = 4x + 5 – 1

C)  2 – 7(1 – 2x) = 5- (x + 9)

D ) ( 1 + 3x ) – (1 -2x) + (-11 – 7x) = 5 

​

Answer 1

A)  13(2x – 3) – 5(2x) = 5(-3 + 6x)  

     26x - 39 - 10x = - 15 + 30x

     16x - 39 = - 15 + 30x

     16x - 30x - 39 +39 = - 15 + 39 + 30x - 30x

     - 14x = 24

       x = 24/-14

       x = 12/-7

B)  2(2x + 7) + 3(3 – 5) 3 = 4x + 5 – 1

     4x + 14 + 3(-2)3 = 4x + 4

     4x + 14 +(-6)3 = 4x + 4

     4x + 14 +(-18) = 4x + 4

     4x + 14 - 18  = 4x + 4

     4x -  4 = 4x + 4

     4x -  4x - 4 + 4 = 4x - 4x + 4 + 4

     0x = 8

C)  2 – 7(1 – 2x) = 5- (x + 9)

     2 - 7 + 14x = 5 - x - 9

     - 5 + 14x = - x - 4

     14x + x - 5 + 5 = - x + x - 4 + 5

     15x = 1

     15x/15 = 1/15

     x = 1/15

D ) ( 1 + 3x ) – (1 -2x) + (-11 – 7x) = 5  

      1 + 3x - 1 + 2x - 11 - 7x = 5

      5x - 7x - 11 + 11 = 5 + 11

      - 2x = 16

      -2x/-2 = 16/-2

        x = -8