(4x+6)/(16x^2-36)/(4x^2+22x-42)

Answer 1

(4x+6)/(4x-6)(4x+6)/(2(x+7)(2x-3)
=
1/(4x-6)/(2(x+7)(2x-3)
=
1/(4(2x-3x)(2x^2+11x-21)

Answer 2

unless you meant
(4x+6) / ((16x^2-36)/(4x^2+22x-42))

Then you have

(4x+6) * (x+7)(4x-6) / (4x-6)(4x+6)
= (x+7)