Приведите подобные слагаемые:

1) 4а+2b+а-b;

2) x-2y-3x+5y;

3) 0,1c-0,3+d-c-2,1d;

4) 8,7-2m+n-[tex]\frac{1}{3}[/tex]m+[tex]\frac{2}{3}[/tex]n.

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