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2) -5x+3x-1-x+3 = -3x+2
3) 6x + 18y
4) -12z-4z+12m = -16z+12m
5) -12ab +6ac +3bc -9ab = -21ab +6ac+3bc
6) 10x²+16x+6
7)3-13n+4n² = 4n²-13n+3
8) -2(a²+a-6)= -2a²-2a+12