6x-3(2y-(y-1+4y))=6x-3(2y-y+1-4y)= 6x-3(-3y+1)= 6x+9y-3= 3(2x+3y)-3
3*5-3= 15-3= 12
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6x-3(2y-(y-1+4y))=6x-3(2y-y+1-4y)= 6x-3(-3y+1)= 6x+9y-3= 3(2x+3y)-3
3*5-3= 15-3= 12