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w in (-oo:+oo)
27 = (3/4)*w // - (3/4)*w
27-((3/4)*w) = 0
(-3/4)*w+27 = 0
27-3/4*w = 0 // - 27
-3/4*w = -27 // : -3/4
w = -27/(-3/4)
w = 36
w = 36
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