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w in (-oo:+oo)
(1/4)*w-(2*w)-4/5 = -83/60 // + -83/60
(1/4)*w-(2*w)-4/5-(-83/60) = 0
(1/4)*w-2*w-4/5+83/60 = 0
7/12-7/4*w = 0 // - 7/12
-7/4*w = -7/12 // : -7/4
w = -7/12/(-7/4)
w = 1/3
w = 1/3
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