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w in (-oo:+oo)
13 = w/3.5 // - w/3.5
13-(w/3.5) = 0
13-0.28571429*w = 0
13-0.28571429*w = 0 // - 13
-0.28571429*w = -13 // : -0.28571429
w = -13/(-0.28571429)
w = 45.49999932
w = 45.49999932
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