Не уверена, но..
3^(x+1)=18^2х*2^-2х*3^(х-1)
3^(х+1)=18*2*3^2х+(-2х)+(х-1)
3^(х+1)=108^(х-1)108/3=36
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Не уверена, но..
3^(x+1)=18^2х*2^-2х*3^(х-1)
3^(х+1)=18*2*3^2х+(-2х)+(х-1)
3^(х+1)=108^(х-1)
108/3=36
1=18^2x*2^-2x=18^2x/2^2x=9^2x
x=0