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w in (-oo:+oo)
-4*w-(2/3) = (7/5)*w-(4/5) // - (7/5)*w-(4/5)
4/5-4*w-((7/5)*w)-(2/3) = 0
(-7/5)*w-4*w-2/3+4/5 = 0
2/15-27/5*w = 0 // - 2/15
-27/5*w = -2/15 // : -27/5
w = -2/15/(-27/5)
w = 2/81
w = 2/81
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