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36*x^2-(1/25) = 0
36*x^2-1/25 = 0
36*x^2 = 1/25 // : 36
x^2 = 1/900
x^2 = 1/900 // ^ 1/2
abs(x) = 1/30
x = 1/30 or x = -1/30
x in { 1/30, -1/30 }
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