Question

помагите 30 балл

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Answer 1

1)3a+3b-2a-2b=a+b
2)4x+4y+10x-5y=14x-y
3)2.4c-7.2d-2.6c+1.3d=-0.2c-5.9d
4)-3/12m-3/4n-3/4m-1/4n=-m-n