11/(x-5)-7/(x-7)-11/(x+2)+7/(x+4)
=11[1/(x-5)-1/(x+2)]-7[1/(x-7)-1/(x+4)]
=77/(x-5)(x+2)-77/(x-7)(x+4)
=77[(x-7)(x+4)-(x-5)(x+2)]/(x-7)(x+4)(x-5)(x+2)
=1386/(x-7)(x+4)(x-5)(x+2)
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11/(x-5)-7/(x-7)-11/(x+2)+7/(x+4)
=11[1/(x-5)-1/(x+2)]-7[1/(x-7)-1/(x+4)]
=77/(x-5)(x+2)-77/(x-7)(x+4)
=77[(x-7)(x+4)-(x-5)(x+2)]/(x-7)(x+4)(x-5)(x+2)
=1386/(x-7)(x+4)(x-5)(x+2)
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