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(x^2)/16-((b^2)/25) = 0
1/16*x^2 = -(-1/25*b^2) // : 1/16
x^2 = 16/25*b^2
x^2 = 16/25*b^2 // ^ 1/2
abs(x) = 4/5*b
x = 4/5*b or x = -(4/5*b)
x in { 4/5*b, -(4/5*b) }
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