794. Упростите выражение:
1) 0,3х + 0,8y + 1,5х + 1,2у;
2)4,2х+5,3у-2,6у-1,8х;
3)1,5а+9,7b+5,8a-1,3b;
4)12,75a+1,85a-9,55a+3,5b

образец ​
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