(2/21)*(x^2-2/2)

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Solution for (2/21)*(x^2-2/2) equation: 


x in (-oo:+oo)

(2/21)*(x^2-(2/2)) = 0

(2/21)*(x^2-1) = 0

2/21*(x^2-1) = 0

( 2/21 )

2/21 = 0

x belongs to the empty set

( x^2-1 )

1*x^2 = 1 // : 1

x^2 = 1

x^2 = 1 // ^ 1/2

abs(x) = 1

x = 1 or x = -1

x in { 1, -1 }

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