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w in (-oo:+oo)
3 = 4-((1/5)*w) // - 4-((1/5)*w)
(1/5)*w-4+3 = 0
1/5*w-1 = 0 // + 1
1/5*w = 1 // : 1/5
w = 1/1/5
w = 5
w = 5
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