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w in (-oo:+oo)
(-2/3)*w+5 = -1 // + 1
(-2/3)*w+1+5 = 0
6-2/3*w = 0 // - 6
-2/3*w = -6 // : -2/3
w = -6/(-2/3)
w = 9
w = 9
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