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keluarkan dulu dari kurung. cara :
- dikali 2 jadi -2. - dikali -3 (- dikali - = +) jadi hasilnya +3.
= 5x - 3y + 5 - 2y + 3x +2
= 8x - 5y + 7
= 5x + 3x - 3y - 2y + 5 + 2
= 8x - 5y + 7
= 7 - 5y + 8x
= -7 + 5y - 8x