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4/(x+3) - 5/(x-1)= (4(x-1)-5(x+3)) / (x+3)(x-1)
=4x - 4- 5x -15/ xkuadrat+2x-3
= -x - 19/(xkuadrat+2x-3)
4x-4-5x-15/(x+3)(x-1)=-x-11/(x+3)(x-1)