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kerjakan dlu sebelah kiri
p/2 - p/3 = 3p/6 - 2p/6 = p/6
p/6 = 1/6 - p/6
p/6 + p/6 = 1/6 , karena penyebutnya semua 6 , boleh dibuang
p + p = 1
2p = 1
p = 1/2