Asymmetric replacement

Start with the set {2,3,4}\{2, 3, 4\}. In each step, choose two numbers aa and bb, and replace them with 0.6a0.8b0.6a-0.8b and 0.8a+0.6b0.8a+0.6b.

(a) Is it possible to reach the set {1,3,5}\{1, 3, 5\}?
(b) Is it possible to reach the set {0,2,5}\{0, 2, 5\}?

(adapted from Engel, Problem Solving Strategies, p.9)

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