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D( x )
4*x+1 = 0
4*x+1 = 0
4*x+1 = 0
4*x+1 = 0 // - 1
4*x = -1 // : 4
x = -1/4
x in (-oo:-1/4) U (-1/4:+oo)
-2 = 13/(4*x+1) // - 13/(4*x+1)
-(13/(4*x+1))-2 = 0
-13*(4*x+1)^-1-2 = 0
-13/(4*x+1)-2 = 0
(-2*(4*x+1))/(4*x+1)-13/(4*x+1) = 0
-2*(4*x+1)-13 = 0
-8*x-15 = 0
(-8*x-15)/(4*x+1) = 0
(-8*x-15)/(4*x+1) = 0 // * 4*x+1
-8*x-15 = 0
-8*x-15 = 0 // + 15
-8*x = 15 // : -8
x = 15/(-8)
x = -15/8
x = -15/8
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