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=> (15x - 12y - 10) - (10x - 5y - 15)
=> 15x - 10x - 12y + 5y - 10 + 15
=> 5x - 7y + 5
15x -12y -10 -10x +5 y - 15
15x - 10x -12y + 5y -10-15
5x -7y -25
selesai