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2^3x-1=2^2×
3×-1=2x
3x-2x=-1
x=-1/1
x=-1
b 27^2×-2=9^x+1
(3^3)^2x-2=(3^2)^x+1
3^6x-6=3^2x+2
6x-6=2x+2
6x-2×=2+6
4×=8
x= 8/4 =2