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12.5-(21000/(y^2)) = 0
12*a^2*y-4*a^3-(12*a*y^2)+y^4+4*y^3 = 0
(5/2)*x
y = 0.43*x^2+10.29*x-7.06;0.43;10.29;-7.06
-((10.29^2-(-7.06*0.43*4))/(0.43*4))
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