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pertama rasionalkan bntuk 1/(akar x -1)
trus samain penyebut dari 1/(akar 3x+1) - 1/(akar x+3) dulu.
ntar bakal jadi (akar x - 1)/(x-1).[(-2)(x-1)]/(akar blablabla)]
nah kan x-1 bisa dicoret trus dapet deh jawabanny.