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w in (-oo:+oo)
(-3/4)*w-12 = 9 // - 9
(-3/4)*w-12-9 = 0
-3/4*w-21 = 0 // + 21
-3/4*w = 21 // : -3/4
w = 21/(-3/4)
w = -28
w = -28
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