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w in (-oo:+oo)
(1/4)*w+2/5 = 2*w+109/10 // - 2*w+109/10
(1/4)*w-(2*w)+2/5-(109/10) = 0
(1/4)*w-2*w+2/5-109/10 = 0
-7/4*w-21/2 = 0 // + 21/2
-7/4*w = 21/2 // : -7/4
w = 21/2/(-7/4)
w = -6
w = -6
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