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(2x+1)-x=(4x-2)-(2x+1)
2x+1-x=4x-2-2x-1
x+1=2x-3
4=x
x=4
2(2x+1)-x=4x-2
4x+2-x=4x-2
4x-4x-x=-2-2
-x=-4/:(-1)
x=4