$\frac{6st^{-4}}{2s^{-2}t^{2}}$
$\frac{6.s.t^{-4}}{2.s^{-2}.t^{2}}$
1/2x - 1/2 + 3+1 =Y
38x+13x+13y-17y
38x+13X+13y-17y
38x+13X+13y-17
1 4/5
4.3+(8.4-5.1)
0.5 as a fraction
25 divided by 3