Упростите выражения
А)3,7а+4,3а = 
б)16,5b -7,5b =
в) 18х-0,7х =

г) 13,9у + 7,2у=
д) 0,4а + 0,5а+0,1а = 
е) 8,6b - 3,2b - 5,4b = 
ж) 2х - 1,5х - 0,3х = 
з)  5у + 0,7х +1,8х =

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