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w in (-oo:+oo)
4/5-((1/3)*w) = 5*w-(52/15) // - 5*w-(52/15)
4/5-((1/3)*w)-(5*w)+52/15 = 0
(-1/3)*w-5*w+4/5+52/15 = 0
64/15-16/3*w = 0 // - 64/15
-16/3*w = -64/15 // : -16/3
w = -64/15/(-16/3)
w = 4/5
w = 4/5
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