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w in (-oo:+oo)
12 = 7*w+7*w+2/6+7/5 // - 7*w+7*w+2/6+7/5
12-(7*w)-(7*w)-(2/6)-(7/5) = 0
12-7*w-7*w-1/3-7/5 = 0
154/15-14*w = 0 // - 154/15
-14*w = -154/15 // : -14
w = -154/15/(-14)
w = 11/15
w = 11/15
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