1. -2x = 12
2. -3x = 15
3. -5x = 8
4. -4x = 10
5. -2.5 = -10
6. -3x= -9
7. -8x = 24
8. 2x + 7 = 13
9. -3x - 3 = 9
10. 3 - 4n = 8 - 2n
11. 5 - 2x = x - 3
12. -2x -3 = -6
13. 3x = 18
14. 2x - 3 = 6
15. 4r + 5 = 8
16. -2v - 5 = 4
17. 8 - 4w = w - 6
18. 2x - 4 = x - 5

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since the airplane is moving with constant speed then the distance travelled can be calculated by x=u*t

in km/h would be:

x=640*3.5=2.240 km

in m/s would be:

u=640 km/h= 640.000 m/h =640.000/ 3600 m/s =177.8 m/s

t= 3.5 h= 3.5 * 3600 s=12.600 s

then x=u*t= 177.8*12.600= 2.240.280 m