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w in (-oo:+oo)
w/4 = -6.4 // + 6.4
w/4+6.4 = 0
1/4*w+6.4 = 0 // - 6.4
1/4*w = -6.4 // : 1/4
w = -6.4/1/4
w = -25.6
w = -25.6
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