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5(2x -y +6) -(8x +3y -10)
10x -5y +30 -8x -3y +10
10x -8x -5y -3y +30 +10
2x -8y +40
10x - 5y + 30 - 8x + 3y - 10
= 2x - 2y + 20
Maaf kalu salah :-)