Приведите подобные слагаемые:
1)-R-R-5a-a-a-a
2)5,17y+9,31y+4,83y-2y
3)15a-a+b-6b
4)-12c-12a+7a+6c
5)1,7x-1,2y-1,7x+0,5y
6)7-x+y+x-y
7)3a-a-b-12b-7
8)1,8y+3-2,8c-0,2-2y
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