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w in (-oo:+oo)
3*w-(9*w)+9/5+9/2 = -30 // + 30
3*w-(9*w)+9/5+9/2+30 = 0
3*w-9*w+9/5+9/2+30 = 0
363/10-6*w = 0 // - 363/10
-6*w = -363/10 // : -6
w = -363/10/(-6)
w = 121/20
w = 121/20
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