1-N power of 3 times (- 1 / 3) cube times 2-N power of 3

3^(1-n) X(-1/3)^3 X3^(2-n)
=3^(1-n)X(-3)^(-1x3)X3^(2-n)
Multiplication of the first and third terms
=3^(3-2n) X（-3）^(-3)
Minus sign ahead of time
=-3^(-2n)

RELATED INFORMATIONS

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