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w in (-oo:+oo)
-((1/7)*w)-3 = 6*w-(234/35) // - 6*w-(234/35)
234/35-((1/7)*w)-(6*w)-3 = 0
(-1/7)*w-6*w+234/35-3 = 0
129/35-43/7*w = 0 // - 129/35
-43/7*w = -129/35 // : -43/7
w = -129/35/(-43/7)
w = 3/5
w = 3/5
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