-(5x+y)-3(2x-3y)(化简)
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-(5x+y)-3(2x-3y)(化简)-(5x+y)-3(2x-3y)(化简)-(5x+y)-3(2x-3y)(化简)-(5x+y)-3(2x-3y)=-5x-y-6x+9y=-11x+8y-11x
-(5x+y)-3(2x-3y)(化简)
-(5x+y)-3(2x-3y)(化简)
-(5x+y)-3(2x-3y)(化简)
-(5x+y)-3(2x-3y)
=-5x-y-6x+9y
=-11x+8y
-11x+8y
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