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w in (-oo:+oo)
w/7.5 = 5/2 // - 5/2
w/7.5-(5/2) = 0
w/7.5-5/2 = 0
0.13333333*w-5/2 = 0 // + 5/2
0.13333333*w = 5/2 // : 0.13333333
w = 5/2/0.13333333
w = 18.75000047
w = 18.75000047
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