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w in (-oo:+oo)
(3/4)*w+3 = 15/4 // - 15/4
(3/4)*w-(15/4)+3 = 0
(3/4)*w-15/4+3 = 0
3/4*w-3/4 = 0 // + 3/4
3/4*w = 3/4 // : 3/4
w = 3/4/3/4
w = 1
w = 1
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