Question

tim x , biet :

1) 5x - 7 = -21 - 2x

2) x+ 15=  20 -  4x

3) 17 - x = 7 - 6x

Answer 1

1) 5x - 7 = -21 - 2x

=> 5x + 2x = -21 + 7

=> 7x = -14

=> x = -2

2) x + 15 = 20 - 4x 

=> x + 4x = 20 - 15

=> 5x = 5

=> x = 1

3) 17 - x = 7 - 6x 

=> 17 - 7 = -6x + x

=> 10 = -5x

=> x = -2

Answer 2

1) 5x - 7 = -21 - 2x

-2x - 5x = -7 + 21

-7x = 14

=> x = -2

2) x+  15 = 20 - 4x

-4x - x = 15-  20

-5x = -5

x = 1

3) 17 - x = 7 - 6x

-6x + x = 17 - 7

-5x = 10 

x = -2