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w in (-oo:+oo)
(6/5)*w-15 = 2/5 // - 2/5
(6/5)*w-(2/5)-15 = 0
(6/5)*w-2/5-15 = 0
6/5*w-77/5 = 0 // + 77/5
6/5*w = 77/5 // : 6/5
w = 77/5/6/5
w = 77/6
w = 77/6
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