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x in (-oo:+oo)
r = ((4*p)/a)*d^2*l // - ((4*p)/a)*d^2*l
r-(((4*p)/a)*d^2*l) = 0
r-4*a^-1*d^2*l*p = 0
r-4*a^-1*d^2*l*p = 0
x naleu017Cy do R
x in (-oo:+oo)
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