Раскройте скобки и приведите подобные слагаемые:
1. (3х + у)- (-х - 4у)
2.(х + 6у)- (8х - 7у)
3.(м + 3) - (6м + 5) - (м - 1)
4. (х - у) + (х + у) - (2х + у)
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