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w in (-oo:+oo)
-3 = (5/2)*w-(5*w)+6 // - (5/2)*w-(5*w)+6
5*w-((5/2)*w)-6-3 = 0
5*w+(-5/2)*w-6-3 = 0
5/2*w-9 = 0 // + 9
5/2*w = 9 // : 5/2
w = 9/5/2
w = 18/5
w = 18/5
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