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w in (-oo:+oo)
15 = (-3/4)*w // - (-3/4)*w
15-((-3/4)*w) = 0
(3/4)*w+15 = 0
3/4*w+15 = 0 // - 15
3/4*w = -15 // : 3/4
w = -15/3/4
w = -20
w = -20
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