(х-1)/2 = 2х-2х /2
x-1/2=2x-x
x-1/2=x
x-1=2x
x-2x=1
-x=1
x=-1
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(х-1)/2 = 2х-2х /2
x-1/2=2x-x
x-1/2=x
x-1=2x
x-2x=1
-x=1
x=-1