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w in (-oo:+oo)
(-2/3)*w+9 = 25/3 // - 25/3
(-2/3)*w-(25/3)+9 = 0
(-2/3)*w-25/3+9 = 0
2/3-2/3*w = 0 // - 2/3
-2/3*w = -2/3 // : -2/3
w = -2/3/(-2/3)
w = 1
w = 1
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