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a. 4x-5y-9-(3x+4y-15)=4x-5y-9-3x-4y+15=4x-3x-5y-4y-9+15=x-9y+6
4x-5y-9-(3x+4y+15)=4x-5y-9-3x-4y-15=4x-3x-5y-4y-9-15=x-9y-24
Semangat!