解不等式1/(x+4)+1/(x+5)>1/(x+6)+1/(x+3)怎么解出来的?

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解不等式1/(x+4)+1/(x+5)>1/(x+6)+1/(x+3)

怎么解出来的?

1/(x+4)-1/(x+3)>1/(x+6)-1/(x+5),1/((x+4)*(x+3))