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w in (-oo:+oo)
(1/4)*w+80 = 3*w+80 // - 3*w+80
(1/4)*w-(3*w)-80+80 = 0
(1/4)*w-3*w-80+80 = 0
-11/4*w = 0 // : -11/4
w = 0
w = 0
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