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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
((1*((115*X)/X))/5)*X = X-6.96 // - X-6.96
((1*((115*X)/X))/5)*X-X+6.96 = 0
(((115*X)/X)/5)*X-X+6.96 = 0
22*X+6.96 = 0 // - 6.96
22*X = -6.96 // : 22
X = -6.96/22
X = -0.31636364
X = -0.31636364
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