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w in (-oo:+oo)
(2/7)*w+5 = 85/21-((2/3)*w) // - 85/21-((2/3)*w)
(2/7)*w+(2/3)*w-(85/21)+5 = 0
(2/7)*w+(2/3)*w-85/21+5 = 0
20/21*w+20/21 = 0 // - 20/21
20/21*w = -20/21 // : 20/21
w = -20/21/20/21
w = -1
w = -1
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