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