which of the following pairs of equations has exactly the same solution?

3/8x=1 and 1/3x=1/8
-3.2x=0.64and x/4= - 0.05
-3/4x=5/2 and 5/2x= -3/4
x/3.2=1.8 and 1.8x=3.2

The pair of equations that has exactly the same solution is -3/4x=5/2 and 5/2x= -3/4.