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w in (-oo:+oo)
-513/70 = 6*w-((3/7)*w)-9 // - 6*w-((3/7)*w)-9
(3/7)*w-(6*w)-513/70+9 = 0
(3/7)*w-6*w-513/70+9 = 0
117/70-39/7*w = 0 // - 117/70
-39/7*w = -117/70 // : -39/7
w = -117/70/(-39/7)
w = 3/10
w = 3/10
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