Упростите выражения :
5,3х + 8 - 7.2у - 2.5х + 10у - 9.4 ;
2,3а+ 1,7в - 3,4с + 1,2а - 2в + 4с ;
0,3х - 9у - 1,5 + 6,2х - 5,6у + 4

Заранее спасибо
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