Question

tìm x:

4x-15=-75-x

72-3x=3x+8

 

Answer 1

a, 4x - 15 = -75 - x

   4x + x = -75 + 15

   5x = -60

   x = -60 : 5

   x = -12

b, 72 - 3x = 3x + 8

   -3x - 3x = 8 - 72

   -6x = -64

   x = -64 : -6

   \(x=\frac{32}{3}\)

Answer 2

a/ 5x=-60 <=> x=-12
b/ -6x=-64 <=>x= 32/3

Answer 3

4x-15=-75-x

4x+x=-75+15

5x   = -60

 x    =-60\(\div\)5

 x    =-12

72-3x = 3x+8

72-8  = 3x+3x

64     = 6x

x       =64\(\div\)6

x     =\(\frac{32}{3}\)