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w in (-oo:+oo)
4-(6*w) = w/2+3.5 // - w/2+3.5
4-(6*w)-(w/2)-3.5 = 0
4-6*w-(w/2)-3.5 = 0
0.5-13/2*w = 0 // - 0.5
-13/2*w = -0.5 // : -13/2
w = -0.5/(-13/2)
w = 0.07692308
w = 0.07692308
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