Question 302212
{{{((7y^2)+(-7y))/(y-1)}}}

= {{{(7y^2-7y)/(y-1)}}}

= {{{((7y)(y-1))/(y-1)}}} 

 cancel out "y-1"
= 7y

{{{((7y^2)-(-7y))/(y-1)}}}

= {{{(7y^2+7y)/(y-1)}}}
= {{{((7y)(y+1))/(y-1)}}}