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w in (-oo:+oo)
1-(7*w) = (2/3)*w-(227/3) // - (2/3)*w-(227/3)
227/3-(7*w)-((2/3)*w)+1 = 0
(-2/3)*w-7*w+227/3+1 = 0
230/3-23/3*w = 0 // - 230/3
-23/3*w = -230/3 // : -23/3
w = -230/3/(-23/3)
w = 10
w = 10
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