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(1/36)*x^2-25 = 48*h // - 48*h
(1/36)*x^2-(48*h)-25 = 0
(1/36)*x^2-48*h-25 = 0
1/36*x^2 = -(-48*h-25) // : 1/36
x^2 = 36*(25-(-48*h))
x^2 = 36*(48*h+25) // ^ 1/2
abs(x) = 6*(48*h+25)^(1/2)
x = 6*(48*h+25)^(1/2) or x = -(6*(48*h+25)^(1/2))
x in { 6*(48*h+25)^(1/2), -(6*(48*h+25)^(1/2)) }
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