(2x+1)(x-1)/2

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Solution for (2x+1)(x-1)/2 equation: 


x in (-oo:+oo)

((2*x+1)*(x-1))/2 = 0

( 2*x+1 )

2*x+1 = 0 // - 1

2*x = -1 // : 2

x = -1/2

( x-1 )

x-1 = 0 // + 1

x = 1

x in { -1/2, 1 }

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