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x≠2 ∧x≠ -5
DF=R-{-5;2}
(2x+1)(x-2) +3x(x+5) 2x²-2+x-2 +3x²+15x 5x²+16x-4
------------------------------- =-------------------------------- = -------------------------
(x+5)(x-2) x²-2x+5x-10 x²+3x-10