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2x^2 - 3xy + y^2 = (x - y)(2x - y)
x^2 - y^2 = (x + y)(x - y)
tembak (x - y), maka sisa
2x - y/(x + y)
2(2p - 4q) - (-p + 2q) / (2p - 4q) + (-p + 2q)
4p - 8q + p - 2q / 2p - 4q - p + 2q
5p - 10q / p - 2q
5(p - 2q)/p - 2q
= 5