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W in (-oo:+oo)
(-2/3)*W+8/27 = -4/5 // + -4/5
(-2/3)*W+8/27-(-4/5) = 0
(-2/3)*W+8/27+4/5 = 0
148/135-2/3*W = 0 // - 148/135
-2/3*W = -148/135 // : -2/3
W = -148/135/(-2/3)
W = 74/45
W = 74/45
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