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