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w in (-oo:+oo)
(2/5)*w+7 = 387/55 // - 387/55
(2/5)*w-(387/55)+7 = 0
(2/5)*w-387/55+7 = 0
2/5*w-2/55 = 0 // + 2/55
2/5*w = 2/55 // : 2/5
w = 2/55/2/5
w = 1/11
w = 1/11
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