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w in (-oo:+oo)
2/3-(5*w) = (1/3)*w-(158/3) // - (1/3)*w-(158/3)
2/3-(5*w)-((1/3)*w)+158/3 = 0
(-1/3)*w-5*w+2/3+158/3 = 0
160/3-16/3*w = 0 // - 160/3
-16/3*w = -160/3 // : -16/3
w = -160/3/(-16/3)
w = 10
w = 10
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