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w in (-oo:+oo)
(-2/5)*w-(1/2) = 7*w+587/10 // - 7*w+587/10
(-2/5)*w-(7*w)-(1/2)-(587/10) = 0
(-2/5)*w-7*w-1/2-587/10 = 0
-37/5*w-296/5 = 0 // + 296/5
-37/5*w = 296/5 // : -37/5
w = 296/5/(-37/5)
w = -8
w = -8
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