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

3/8x=1 and 1/3x=1/8
-3/4x=5/2 and 5/2x=-3/4
X/3.2=1.8 and 1.8x=3.2
-3.32x=0.64 and x/4=-0.05

The pair of equations that has exactly the same solution is: X/3.2=1.8 and 1.8x=3.2