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