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D( x )
x+140 = 0
x+140 = 0
x+140 = 0
x+140 = 0 // - 140
x = -140
x in (-oo:-140) U (-140:+oo)
(2*(x-140))/(x+140) = 0
x-140 = 0 // + 140
x = 140
x = 140
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