- 2n - h(4rx - 6s) - 3rx + 3s =
= - 2n - h×4rx - h×(- 6s) - 3rx + 3s
= - 2n - 4hrx + 6hs - 3rx + 3s
= 2(3hs - 2hrx - 2) - 3(rx - s)
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