Question 591582
{{{((y^2+4y-21)/(4y^2-9y-9 ))/((2y^2-7y-4)/(4y^2-13y-12))}}}





{{{((y^2+7y-3y-21)/(4y^2-12y+3y-9 ))/((2y^2-8y+y-4)/(4y^2-16y+3y-12))}}}



{{{(((y+7)(y-3))/((y-3)(4y+3)))/(((y-4)(2y+1))/((y-4)(4y+3)))}}}




{{{(((y+7)(y-3))/((y-3)(4y+3)))/(((y-4)(2y+1))/((y-4)(4y+3)))}}}


Inverse the second fraction and multiply


{{{(((y+7)(cross(y-3)))/((cross(y-3)(cross(4y+3)))))*(((cross(y-4)(cross(4y+3))))/((cross(y-4))(2y+1)))}}}


{{{(y+7)/(2y+1)}}}