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w in (-oo:+oo)
(-2/3)*w+5 = 4 // - 4
(-2/3)*w-4+5 = 0
1-2/3*w = 0 // - 1
-2/3*w = -1 // : -2/3
w = -1/(-2/3)
w = 3/2
w = 3/2
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