x*x/2=12.5

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Solution for x*x/2=12.5 equation: 


x in (-oo:+oo)

(x*x)/2 = 12.5 // - 12.5

(x*x)/2-12.5 = 0

1/2*x^2 = 12.5 // : 1/2

x^2 = 25

x^2 = 25 // ^ 1/2

abs(x) = 5

x = 5 or x = -5

x in { 5, -5 }

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