Привести подобные слагаемые и упростить выражение.
1. 4,6X-5,8+2,9+7,8X
2. 5a+6,1b-7,3a-3,6
3. 3 (a-7,2)+2,4a+7,5
4. 2,1 (2x+6)-(3,4x+5,9)
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