Раскройте скобки и приводите подобные слагаемые (срочно дам 20 б)
1) 10a+b-10b-a
2)-8y+7x+6y+7x
3)-8x+5.2a+3x+5a
4)5a+7a-9.2m+15m
5)2/7x-4/9y-5/14x+2/3y
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