数列\(\{a _{n} \}\)是等差数列，\(S _{n}\)为其前\(n\)项和，且\(a _{5} =3a _{2}\)，\(S _{7} =14a _{2} +7\)，数列\(\{b _{n} \}\)前\(n\)项和为\(T _{n}\)，且满足\(3b _{n} =2T _{n} +3\)，\(n∈N*\)．
\((\)Ⅰ\()\)求数列\(\{a _{n} \}\)和\(\{b _{n} \}\)的通项公式；
\((\)Ⅱ\()\)设数列\(\{ \dfrac {a_{n}}{b_{n}}\}\)的前\(n\)项和为\(R _{n}\)，求\(R _{n}\)．