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w in (-oo:+oo)
w/2.8 = 4-2 // - 4-2
w/2.8-4+2 = 0
0.35714286*w-2 = 0 // + 2
0.35714286*w = 2 // : 0.35714286
w = 2/0.35714286
w = 5.59999996
w = 5.59999996
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