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3/4-(12*x^2) = 0
3/4-12*x^2 = 0
-12*x^2 = -3/4 // : -12
x^2 = 1/16
x^2 = 1/16 // ^ 1/2
abs(x) = 1/4
x = 1/4 or x = -1/4
x in { 1/4, -1/4 }
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