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x - 4
x 1
(x-4) (x+1) > 0
x-4>0 x+1 >0
x > 4 x > -1 --------------------------------------------
-1 0 4
c.s = ]4 , +∞[
2x - 3 < 0
2x < 3
x < 3/2 c.s. = ]-∞, 3/2[