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w in (-oo:+oo)
(2/5)*w-6 = (7/5)*w // - (7/5)*w
(2/5)*w-((7/5)*w)-6 = 0
(2/5)*w+(-7/5)*w-6 = 0
-w-6 = 0 // + 6
-w = 6 // * -1
w = -6
w = -6
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