Question

bai 1 tim x biet;

1) 3x - 6 = 5x + 2

2) 15 - x =4x - 5

3) x - 15= 6 + 4x

4) -12 + x=5x - 20

5) 7x - 4 =20 + 3x

Answer 1

1) 3x - 6 = 5x + 2

=> 3x - 5x = 2 + 6

=> -2x = 8 

=> x = -4

2) 15  - x = 4x - 5

=> 15 + 5 = 4x + x 

=> 20 = 5x

=> x = 4

3) x - 15 = 6 + 4x

=> x - 4x = 6 + 15

=> -3x = 21

=> x = -7

4) -12 + x = 5x - 20 

=> x - 5x = -20 + 12

=> -4x = -8

=> x = 2

5) 7x - 4 = 20 + 3x

=> 7x - 3x = 20 + 4

=> 4x = 24

=> x = 6

Answer 2

1) 3x-  6 = 5x + 2

5x - 3x = -6 - 2

2x = -8 => x = -4

Tương tự như trên 

Answer 3

2x-8/-3+x=-5x+6/4

Answer 4

qwertyuiopxcvbnm,./

Answer 5

      Bài làm :

1) 3x - 6 = 5x + 2

<=> 3x - 5x = 2 + 6

<=> -2x = 8 

<=> x = -4

2) 15  - x = 4x - 5

<=> 15 + 5 = 4x + x 

<=> 20 = 5x

<=> x = 4

3) x - 15 = 6 + 4x

<=> x - 4x = 6 + 15

<=> -3x = 21

<=> x = -7

4) -12 + x = 5x - 20 

<=> x - 5x = -20 + 12

<=> -4x = -8

<=> x = 2

5) 7x - 4 = 20 + 3x

<=> 7x - 3x = 20 + 4

<=> 4x = 24

<=> x = 6