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w in (-oo:+oo)
w/5+4.1 = -8.4 // + 8.4
w/5+4.1+8.4 = 0
1/5*w+12.5 = 0 // - 12.5
1/5*w = -12.5 // : 1/5
w = -12.5/1/5
w = -62.5
w = -62.5
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