n*(4/5n)=320

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Solution for n*(4/5n)=320 equation: 


n in (-oo:+oo)

(4/5)*n*n = 320 // - 320

(4/5)*n*n-320 = 0

4/5*n^2 = 320 // : 4/5

n^2 = 400

n^2 = 400 // ^ 1/2

abs(n) = 20

n = 20 or n = -20

n in { 20, -20 }

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