X^2/4-1

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Solution for X^2/4-1 equation: 


X in (-oo:+oo)

(X^2)/4-1 = 0

1/4*X^2 = 1 // : 1/4

X^2 = 4

X^2 = 4 // ^ 1/2

abs(X) = 2

X = 2 or X = -2

X in { 2, -2 }

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