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Aflati numarul x din:
1. 2(x+3.9)+1.2=20
2. 18+2(2x+0.6)-14.5=21
3. 2x+0.4=x+1.5
4. 4.3x+5=x+10.5
5. 5x-6=3,8x+1,8
6. 4.9(x+3)+5-1.4x=82
Ajutor!!
Ofer 15 puncte+coronita!!
Ma ajutati??