x*4/5x=320

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Solution for x*4/5x=320 equation: 


x in (-oo:+oo)

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

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

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

x^2 = 400

x^2 = 400 // ^ 1/2

abs(x) = 20

x = 20 or x = -20

x in { 20, -20 }

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