Задание 4. Раскройте скобки, приведите подобные слагаемые по образцу

1. (3х + у) – (- х – 4у) = 3х + у + х + 4у = 4х + 5у

2. (х + 6у) – (8х – 7у)

3. (а + в) – (а – в)

4. (а = 3) – (6а + 5) – (а – 1)

5. (х – у) + (х – у) – (2х + у)
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