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w in (-oo:+oo)
13 = 6*w+w+3/7+6/4 // - 6*w+w+3/7+6/4
13-(6*w)-w-(3/7)-(6/4) = 0
13-6*w-w-3/7-3/2 = 0
155/14-7*w = 0 // - 155/14
-7*w = -155/14 // : -7
w = -155/14/(-7)
w = 155/98
w = 155/98
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