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b) 5a+9b+8c
c) -2x
d) abc+1.5ab
6a+12b-3c-4b+b+11c-a=5a+9b+8c
5xy+3x-2y-0,3xy-y-4,7yx+3y-5x=-2x
-abc+3ba-0,5ab+2bac-0,25ba-0,75ab=abc+1.5ab
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