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w in (-oo:+oo)
(1/2)*w-4 = (3/2)*w // - (3/2)*w
(1/2)*w-((3/2)*w)-4 = 0
(1/2)*w+(-3/2)*w-4 = 0
-w-4 = 0 // + 4
-w = 4 // * -1
w = -4
w = -4
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