(4/5)x^2=5

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Solution for (4/5)x^2=5 equation: 


x in (-oo:+oo)

(4/5)*x^2 = 5 // - 5

(4/5)*x^2-5 = 0

4/5*x^2 = 5 // : 4/5

x^2 = 25/4

x^2 = 25/4 // ^ 1/2

abs(x) = 5/2

x = 5/2 or x = -5/2

x in { 5/2, -5/2 }

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