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w in (-oo:+oo)
6.5 = w/1.3 // - w/1.3
6.5-(w/1.3) = 0
6.5-0.76923077*w = 0
6.5-0.76923077*w = 0 // - 6.5
-0.76923077*w = -6.5 // : -0.76923077
w = -6.5/(-0.76923077)
w = 8.44999999
w = 8.44999999
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