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((4*x)/2)*x^3+3*x^2-7 = 0
2*x^4+3*x^2-7 = 0
t_1 = x^2
2*t_1^2+3*t_1^1-7 = 0
2*t_1^2+3*t_1-7 = 0
DELTA = 3^2-(-7*2*4)
DELTA = 65
DELTA > 0
t_1 = (65^(1/2)-3)/(2*2) or t_1 = (-65^(1/2)-3)/(2*2)
t_1 = (65^(1/2)-3)/4 or t_1 = (-(65^(1/2)+3))/4
t_1 = (-(65^(1/2)+3))/4
x^2-((-(65^(1/2)+3))/4) = 0
x^2+(1/4)*(65^(1/2)+3) = 0
1*x^2 = -(1/4*(65^(1/2)+3)) // : 1
x^2 = -1/4*(65^(1/2)+3)
t_1 = (65^(1/2)-3)/4
x^2-((65^(1/2)-3)/4) = 0
1*x^2 = (65^(1/2)-3)/4 // : 1
x^2 = (65^(1/2)-3)/4
x^2 = (65^(1/2)-3)/4 // ^ 1/2
abs(x) = ((65^(1/2)-3)^(1/2))/2
x = ((65^(1/2)-3)^(1/2))/2 or x = -(((65^(1/2)-3)^(1/2))/2)
x in { ((65^(1/2)-3)^(1/2))/2, -(((65^(1/2)-3)^(1/2))/2) }
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