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D( x )
x+1 = 0
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-1) U (-1:+oo)
(5*x+2)/(x+1) = 4.88 // - 4.88
(5*x+2)/(x+1)-4.88 = 0
(5*x+2)/(x+1)+(-4.88*(x+1))/(x+1) = 0
5*x-4.88*(x+1)+2 = 0
0.12*x-2.88 = 0
(0.12*x-2.88)/(x+1) = 0
(0.12*x-2.88)/(x+1) = 0 // * x+1
0.12*x-2.88 = 0
0.12*x-2.88 = 0 // + 2.88
0.12*x = 2.88 // : 0.12
x = 2.88/0.12
x = 24
x = 24
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