Exponent Summary

Answer is: $x^{15}$

Multiplication law: $x^3\cdot x^{12}=x^{15}$

Division law: $x^{16}\div x=x^{15}$

Power law: $(x^3)^5=x^{15}$

Negative law: $1\div x^{-15}=x^{15}$

Fraction law: $x^{30\div 2}=x^{15}$

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