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$-7$ , where $a$ is a constant. Find the value of $a$$\newline$It is given that the constant term in the expansion of $\left(2+\frac{1}{x}\right)^{2}(1-3 x)^{n^{2}}$ is $67$ , where $n$ is a positive integer. Find the value of $n$.$\newline$$$\left(4+\frac{4}{x}+\frac{1}{x^{2}}\right)\left[C_{0}^{n}+C_{d}^{n}(-3 x)+C_{2}^{n} 9\right.$$