Question 765018
<pre>

{{{(-12*t^7+18*t^9)/(-6*t^3)}}}

= {{{((cross(-6))*t^7)*(2 - 3*t^2)/(cross(-6)*t^3)}}}

= {{{t^(7-3)*(2 - 3*t^2)}}}

= {{{t^4*(2 - 3*t^2)}}}

:)