\(A=\left(\dfrac{1}{3x+2}+\dfrac{1}{3x-2}\right):\dfrac{1}{3x+2}\)
\(A=\left(\dfrac{1\left(3x-2\right)}{\left(3x-2\right)\left(3x+2\right)}+\dfrac{3x+2}{\left(3x-2\right)\left(3x+2\right)}\right).3x+2\) \(A=\dfrac{3x-2+3x+2}{\left(3x-2\right)\left(3x+2\right)}.3x+2\)
\(A=\dfrac{6x.\left(3x+2\right)}{\left(3x+2\right)\left(3x-2\right)}\)
\(A=\dfrac{6x}{3x-2}\)