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w in (-oo:+oo)
(2/5)*w-6 = 7/5 // - 7/5
(2/5)*w-(7/5)-6 = 0
(2/5)*w-7/5-6 = 0
2/5*w-37/5 = 0 // + 37/5
2/5*w = 37/5 // : 2/5
w = 37/5/2/5
w = 37/2
w = 37/2
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