(7x+1)/(x²+4x+3)-1>0
(7x+1-x²-4x-3)/(x²+4x+3)>0
(x²-3x+2)/(x²+4x+3)<0<br>x²-3x+2=0⇒x1+x2=3 U x1*x2=2⇒x1=1 U x2=2
x²+4x+3=0⇒x3+x4=-4 U x3*x4=3⇒x3=-3 U x4=-1
+ _ + _ +
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-3 -1 1 2
x∈(-3;-1) U (1;2)