Question

tìm x biết : 

a . 5x - 2x - 153 = -279 

b . 7x - 36 = 4x - 75 

 

Answer 1

a . 5x - 2x - 153 = -279 

3x = -279 + 153

3x = -126

x = -126 : 3

x = -42

b . 7x - 36 = 4x - 75 

7x - 4x = 36 - 75

3x = -39

x = -39 : 3

x = -13

Answer 2

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Answer 3

a . 5x - 2x - 153 = -279 

3x =-126

x=-42

hok tốt !

Answer 4

a) 5x - 2x - 153 = -279

=> 3x - 153 = -279

=> 3x = -279 + 153

=> 3x = -126

=> x = -126 : 3

=> x = -42

Vậy x = -42

b) 7x - 36 = 4x - 75

=> 7x - 4x = -75 + 36

=> 3x = -39

=> x = -39 : 3

=> x = -13

Vậy x = -13

Answer 5

     5x - 2x - 153 = -279

=> 3x - 153 = -279

=> 3x = -279 + 153

=> 3x = -126

=> x = -126 : 3

=> x = -42

vậy____