Упростите выражение:
1) 2,8x-0,6+4,2x+16,8-7x
2) 13,5y+7- 5,2 +8,9y-22,4
3) 1,5x-1,8+3,1x-2,9+1,6x
4) 5y-y+0,8+1,6-3y-y
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