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D( x )
2*(x+3) = 0
x+3 = 0
2*(x+3) = 0
2*(x+3) = 0
x+3 = 0 // - 3
x = -3
x+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
x in (-oo:-3) U (-3:+oo)
(2*x+1)/(x+3) = (6*x+7)/(2*(x+3))-((2*x+5)/(2*(x+3))) // - (6*x+7)/(2*(x+3))-((2*x+5)/(2*(x+3)))
(2*x+1)/(x+3)-((6*x+7)/(2*(x+3)))+(2*x+5)/(2*(x+3)) = 0
(2*x+1)/(x+3)+(-1*(6*x+7))/(2*(x+3))+(2*x+5)/(2*(x+3)) = 0
(2*(2*x+1))/(2*(x+3))+(-1*(6*x+7))/(2*(x+3))+(2*x+5)/(2*(x+3)) = 0
2*(2*x+1)-1*(6*x+7)+2*x+5 = 0
2*x-2*x-5+5 = 0
0 = 0
0/(2*(x+3)) = 0
0/(2*(x+3)) = 0 // * 2*(x+3)
0 = 0
x belongs to the empty set
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