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(5*x^2)/3-180 = 0
5/3*x^2 = 180 // : 5/3
x^2 = 108
x^2 = 108 // ^ 1/2
abs(x) = 6*3^(1/2)
x = 6*3^(1/2) or x = -(6*3^(1/2))
x in { 6*3^(1/2), -(6*3^(1/2)) }
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