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w in (-oo:+oo)
442/105 = (-2/3)*w-((4/5)*w)+4 // - (-2/3)*w-((4/5)*w)+4
(4/5)*w-((-2/3)*w)+442/105-4 = 0
(2/3)*w+(4/5)*w+442/105-4 = 0
22/15*w+22/105 = 0 // - 22/105
22/15*w = -22/105 // : 22/15
w = -22/105/22/15
w = -1/7
w = -1/7
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