3^х+1=27^х-1
3^х+1=3^3(х-1)
х+1=3х-3
х-3х=-3-1
-2х=-4
х=2
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3^х+1=27^х-1
3^х+1=3^3(х-1)
х+1=3х-3
х-3х=-3-1
-2х=-4
х=2