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Hi. I'm looking for some help on solving some equations... I find these 3 Impossible

0.5n + 2.8 - 0.4n = 6.2 - 0.1n

4 = 9 - 6w + 3 - 5w

2q - 4 + 8q = 7q - 8 + 3q

Please help me.. These are hard to me x.x

n = 17

I hope I helped. I'm too lazy to solve the rest. XD

PS: The guy in purple from your avatar is me. :(

-0.2n = 3.4 *  im not sure *

4 = 9 - 6w + 3 - 5w
6w + 5w = 4 - 9 + 3
11w = -2
w = -2 / 11

2q - 4 + 8q = 7q - 8 + 3q
2q + 8q - 7q - 3q = -8 + 4
10q - 7q -3q = -4
3q - 3q = -4
0q = -4