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w in (-oo:+oo)
(3/4)*w = 9/2 // - 9/2
(3/4)*w-(9/2) = 0
(3/4)*w-9/2 = 0
3/4*w-9/2 = 0 // + 9/2
3/4*w = 9/2 // : 3/4
w = 9/2/3/4
w = 6
w = 6
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