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(7*(3+5))/4-(3*x^2)+5 = 0
(7*(3+5))/4-3*x^2+5 = 0
-3*x^2 = -19 // : -3
x^2 = 19/3
x^2 = 19/3 // ^ 1/2
abs(x) = (19/3)^(1/2)
x = (19/3)^(1/2) or x = -(19/3)^(1/2)
x in { (19/3)^(1/2), -(19/3)^(1/2) }
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