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w in (-oo:+oo)
(4/5)*w-4 = (9/5)*w // - (9/5)*w
(4/5)*w-((9/5)*w)-4 = 0
(4/5)*w+(-9/5)*w-4 = 0
-w-4 = 0 // + 4
-w = 4 // * -1
w = -4
w = -4
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