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w in (-oo:+oo)
(-4/5)*w = -9 // + 9
(-4/5)*w+9 = 0
9-4/5*w = 0 // - 9
-4/5*w = -9 // : -4/5
w = -9/(-4/5)
w = 45/4
w = 45/4
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