7.
已知函数\(f\left(x\right)=\sin \left(2x+ \dfrac{π}{6}\right)+2{\sin }^{2}x \)
\((\)Ⅰ\()\)求函数\(f(x)\)的最小正周期和单调递减区间;
\((\)Ⅱ\()\)在\(∆ABC \)中,\(a\),\(b\),\(c\)分别是角\(A\),\(B\),\(C\)的对边,若\(f\left( \dfrac{A}{2}\right)= \dfrac{3}{2},b+c=7, ∆ABC \)的面积为\(2 \sqrt{3} \),求\(a\)边的长.