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w in (-oo:+oo)
(1/5)*w-(7*w)-3 = -389/5 // + -389/5
(1/5)*w-(7*w)-(-389/5)-3 = 0
(1/5)*w-7*w+389/5-3 = 0
374/5-34/5*w = 0 // - 374/5
-34/5*w = -374/5 // : -34/5
w = -374/5/(-34/5)
w = 11
w = 11
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