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w in (-oo:+oo)
(1/4)*w = 13/4 // - 13/4
(1/4)*w-(13/4) = 0
(1/4)*w-13/4 = 0
1/4*w-13/4 = 0 // + 13/4
1/4*w = 13/4 // : 1/4
w = 13/4/1/4
w = 13
w = 13
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