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w in (-oo:+oo)
(3/5)*w+6 = 51/8 // - 51/8
(3/5)*w-(51/8)+6 = 0
(3/5)*w-51/8+6 = 0
3/5*w-3/8 = 0 // + 3/8
3/5*w = 3/8 // : 3/5
w = 3/8/3/5
w = 5/8
w = 5/8
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