Question

cuanto es 1/2X-1/3X ?

Answer 1

$\frac{1}{2}x - \frac{1}{3}x = \frac{3x-2x}{6} = \frac{1}{6}x$

Answer 2

1/2x - 1/3x 
1*3/2*3x - 1*2/3*2x
= 3/6x- 2/6x = 1/6x