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