Question

3/4+1/4:x=2/5

Answer 1

3/4 + 1/4:x = 2/5

=> 1/4:x = -7/20

=> x = -5/7

Answer 2

3/4 + 1/4 : x  = 2/5 

=> 1/4 : x = 2/5 - 3/4 

=> 1/4 : x = -7/20

=> x = 1/4 : (-7/20)

=> x = -5/7

Answer 3

3/4+1/4:x=2/5

=> 1/4:x=2/5-3/4

=> 1/4:x=-7/20

=>      x=1/4:(-7/20)

=>      x=-5/7

          Đ/s:x=-5/7