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=x^2 - 4y^2 + 2x^2 - 3xy - y^2
= 3x^2 - 3xy - 5y^2
ket: baca ^ sebagai pangkat
x²-4y² + 2x²-3xy-y²
x²+2x²-4y²-y²-3xy
3x²-5y²-3xy