If $5\sqrt{5}\times 5^{3}+5^{-\frac{3}{2}}$=$5^{a+2}$ ,then the value of a is

If $5\sqrt{5}\times 5^{3}+5^{-\frac{3}{2}}$=$5^{a+2}$ ,then the value of a is
1). 4
2). 5
3). 6
4). 8

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