sol
Set A=3^x>0
9^(x+2)=36
9^x*81=36
9^x=36/81
A^2=4/9
A=2/3>0
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sol
Set A=3^x>0
9^(x+2)=36
9^x*81=36
9^x=36/81
A^2=4/9
A=2/3>0