Question

a) 2 (3 – x ) = 3 ( x -4) + 15


b) 3 ( 5 – x ) – 3 ( 1 – 2x) = 42


c) ( 4x + 6) – 2x = (x – 6) + 10 +14


d) ( x – 3) – ( x + 2) + 2( x – 1) – 5 = 0


e) 3x -2 ( 4x – 3 ) = 2 – 3( x – 1)


f) 3( x- 1) – ( x – 3) + 5 ( x – 2) = 18


g) 5( x – 3 ) – 4 ( x + 2 ) = 2 + 3( 1 – 2x)



h) 2x + 5 - 5x = -1


i) 5 + 6x = 5x + 2

j) x + 2x - 1 - 3 = x

Answer 1

Resposta:

Explicação passo-a-passo:

a) 6 - 2x = 3x - 12 + 15

   -2x - 3x = -12 + 15 - 6

   -5x = -3 * (-1)

      x = 3/5

b) 15 - 3x - 3 + 6x = 42  (na miltiplicação sinais iguais fica positivo, sinais dieferente resultado negativo)

   -3x +6x = 42- 15+3

   3x = 30

    x = 30/3

    x = 10

c) 4x + 6 - 2x = x - 6 + 10 + 14

  4x - 2x - x = -6 +10 + 14 - 6

  x = 12

d) x - 3 - x - 2 + 2x - 2 - 5 = 0

  x - x + 2x = 3 + 2 + 2 + 5

  2x = 12

  x = 12/2

  x = 6

e) 3x - 8x + 6 = 2 - 3x + 3

  3x - 8x + 3x = 2 + 3 - 6

  -2x = -1   * (-1)

    x = 1/2

f) 3x - 3 - x + 3 + 5x - 10 = 18

  3x - x + 5x = 18 + 3 - 3 + 10

  7x = 28

   x = 28/7

  x = 4

g) 5x - 15 -4x - 8 = 2 + 3 - 6x

   5x - 4x + 6x = 2 + 3 + 15 + 8

  7x  = 28

  x = 28/7

  x = 4

h) 2x - 5x = -1 - 5

   -3x = -6  *(-1)

    x = 6/3

   x = 3

i) 6x - 5x = 2 - 5

 x = -3

j) x + 2x - x = 1 + 3

  2x = 4

  x = 4/2

  x= 2