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= 8x+4y-3x+6y
= 5x+10y
2. (3y - 5x) (4x - y)
= 12xy-3y²-20x²+5xy
= 17xy-3y²-20x²
3. ab + 8bc + 3a - 5ab - 8bc + 5a
= ab-5ab+8bc-8bc+3a+5a
= -4ab + 8a
4. kurang tau