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x≠3 i x≠ -3
1*(x+3)/(x-3)(x+3) - (1-x)/(x-3)(x+3)
[ (x+3) - (1-x) ]/(x-3)(x+3)=(x+3-1+x)/(x-3)(x+3)=(2x+2)/(x-3)(x+3)=
2(x+1)/(x-3)(x+3)