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w in (-oo:+oo)
10-4*w = 20/3 // - 20/3
10-4*w-(20/3) = 0
10-4*w-20/3 = 0
10/3-4*w = 0 // - 10/3
-4*w = -10/3 // : -4
w = -10/3/(-4)
w = 5/6
w = 5/6
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