Question

A. 7x-6 = 3 - 5x =

B. 4x - 15 = 12 -5x =

C. 4 ( x - 5 ) = 3 ( x - 2 ) =

D. 3n + 11 = 2 ( n - 7 ) =

E. 3 ( x - 14 ) = 7 ( x - 18 ) =

F. 9X - 3 - 4X = 8 X - 7 + X =

Answer 1

Olá!

Respostas:

A) x = 0,75 / B) x = 3 / C) x = 14 / D) n = -25 / E) x = 21 / F) x = 0.18

Contas:

A) 7x-6 = 3 - 5x

7x + 5x = 3 + 6

12x = 9

x = 9/12

x = 0,75

B) 4x - 15 = 12 -5x

4x + 5x = 12 + 15

9x = 27

x = 27/9

x = 3

C) 4 ( x - 5 ) = 3 ( x - 2 )

4x - 20 = 3x - 6

4x - 3x = 20 - 6

x = 14

D) 3n + 11 = 2 ( n - 7 )

3n + 11 = 2n - 14

11 + 14 = 2n - 3n

25 = -1n

25/-1 = n

n = -25

E) 3 ( x - 14 ) = 7 ( x - 18 )

3x - 42 = 7x - 126

-42 + 126 = 7x - 3x

84 = 4x

x = 84/4

x = 21

F) 9X - 3 - 4X = 8 X - 7 + X

-13x = 8x - 7 + X + 3

-13x -8x - x = -7 + 3

-22x = -4

x = -4/-22

x = 0.18