3=9/3z2

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Solution for 3=9/3z2 equation: 


z in (-oo:+oo)

3 = (9/3)*z^2 // - (9/3)*z^2

3-((9/3)*z^2) = 0

3-3*z^2 = 0

-3*z^2 = -3 // : -3

z^2 = 1

z^2 = 1 // ^ 1/2

abs(z) = 1

z = 1 or z = -1

z in { 1, -1 }

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