Раскройте скобки и приведите подобные слагаемые:
-3(х-у)+4(2х+у)
2(а-3(а-5))-7а
4(3х-9у)-7(х-а)+8(2а-х)
-(а-в-с)-(в-с-а)+2(а+в+с)
Даю 34 балла.
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