1/2(x2+x)

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Solution for 1/2(x2+x) equation: 


x in (-oo:+oo)

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

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

x^2+x = 0

x*(x+1) = 0

x+1 = 0 // - 1

x = -1

x*(x+1) = 0

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

( x+1 )

x+1 = 0 // - 1

x = -1

( x )

x = 0

x in { -1, 0 }

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