Question

1. 2a+3a
2. 7x-15x
3.-17d+3d
4.-2,1y+7y
5. 2,5x+x
6. -a-0,8a
7. 1/3x-2x
8. 1/2a+1/5a
9. 5/6b-b

Answer 1

1)5а
2)-8х
3)-14d
4) 4.9
5)3.5х
6)1,8а
7)-5/3х
8)7/10а
9)-1/6b

Answer 2

1. 2а+3а= а(2+3)=а=5. 2. 7х-15х; х=15-7; х=8. 3. -17d+3d; d=17-3; d=14. 4. -2.1y+7y; y=2.1-7; y=-4.9.