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w in (-oo:+oo)
(3/5)*w-((3/10)*w)-25+16 = 0
(3/5)*w+(-3/10)*w-25+16 = 0
(3/5-3/10)*w-25+16 = 0 // - 16-25
(3/5-3/10)*w = -(16-25) // : 3/5-3/10
w = (-(16-25))/(3/5-3/10)
w = (25-16)/(3/5-3/10)
w = (25-16)/(3/5-3/10)
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