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w in (-oo:+oo)
12 = (5/9)*w-3 // - (5/9)*w-3
3-((5/9)*w)+12 = 0
(-5/9)*w+3+12 = 0
15-5/9*w = 0 // - 15
-5/9*w = -15 // : -5/9
w = -15/(-5/9)
w = 27
w = 27
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