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D( x )
15*x+33 = 0
6*x+11 = 0
15*x+33 = 0
15*x+33 = 0
15*x+33 = 0 // - 33
15*x = -33 // : 15
x = -33/15
x = -11/5
6*x+11 = 0
6*x+11 = 0
6*x+11 = 0 // - 11
6*x = -11 // : 6
x = -11/6
x in (-oo:-11/5) U (-11/5:-11/6) U (-11/6:+oo)
11/(6*x+11)-(3/(15*x+33)) = 0
11/(6*x+11)-3*(15*x+33)^-1 = 0
11/(6*x+11)-3/(15*x+33) = 0
(11*(15*x+33))/((6*x+11)*(15*x+33))+(-3*(6*x+11))/((6*x+11)*(15*x+33)) = 0
11*(15*x+33)-3*(6*x+11) = 0
147*x+330 = 0
(147*x+330)/((6*x+11)*(15*x+33)) = 0
(147*x+330)/((6*x+11)*(15*x+33)) = 0 // * (6*x+11)*(15*x+33)
147*x+330 = 0
147*x+330 = 0 // - 330
147*x = -330 // : 147
x = -330/147
x = -110/49
x = -110/49
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