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D( x )
2*x+33 = 0
2*x+33 = 0
2*x+33 = 0
2*x+33 = 0 // - 33
2*x = -33 // : 2
x = -33/2
x in (-oo:-33/2) U (-33/2:+oo)
x/(2*x+33) = 1 // - 1
x/(2*x+33)-1 = 0
x/(2*x+33)+(-1*(2*x+33))/(2*x+33) = 0
x-1*(2*x+33) = 0
-x-33 = 0
(-x-33)/(2*x+33) = 0
(-x-33)/(2*x+33) = 0 // * 2*x+33
-x-33 = 0
-x-33 = 0 // + 33
-x = 33 // * -1
x = -33
x = -33
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