723. Замените выражение тождественно равным, используя правило раскрытия скобок:
1) (3х + y) — (х – 4у)
2) (х + 6у) — (8х - у)
3) (m+n) + (m – n)
4) (6m + 5) – (m — 1)
5) (2x +y) — (х+у)
6) (2m — 3n) + (2m + 3n).​
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