3^(х+2+х-1)=1

3^(2х+1)=3^0

2х+1=0

2х=-1

х=-(1/2)

3^(х+2)×3^(х-1)=1

3^х×3^2×3^х×3^-1=1

3^2х × 3=1

3^2х=1/3

3^2х=3^-1

2х=-1

х=-0,5

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Ответ:-0,5