1)3a+2b-c+a+b-2c=4a+3b-3c
2)2x+y-z+x+2y-2z=3x+3y-3z
3)12x²-y³+x+x+y³-10x²=2x²+2x
4)15m³+n²-m+2m-n²-5m³=10m³+m
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1)3a+2b-c+a+b-2c=4a+3b-3c
2)2x+y-z+x+2y-2z=3x+3y-3z
3)12x²-y³+x+x+y³-10x²=2x²+2x
4)15m³+n²-m+2m-n²-5m³=10m³+m