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D( x )
x+525000 = 0
x+525000 = 0
x+525000 = 0
x+525000 = 0 // - 525000
x = -525000
x in (-oo:-525000) U (-525000:+oo)
2 = 1312500/(x+525000) // - 1312500/(x+525000)
2-(1312500/(x+525000)) = 0
2-1312500*(x+525000)^-1 = 0
2-1312500/(x+525000) = 0
(2*(x+525000))/(x+525000)-1312500/(x+525000) = 0
2*(x+525000)-1312500 = 0
2*x-262500 = 0
(2*x-262500)/(x+525000) = 0
(2*x-262500)/(x+525000) = 0 // * x+525000
2*x-262500 = 0
2*x-262500 = 0 // + 262500
2*x = 262500 // : 2
x = 262500/2
x = 131250
x = 131250
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