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w in (-oo:+oo)
(21/4)*w = 63/4 // - 63/4
(21/4)*w-(63/4) = 0
(21/4)*w-63/4 = 0
21/4*w-63/4 = 0 // + 63/4
21/4*w = 63/4 // : 21/4
w = 63/4/21/4
w = 3
w = 3
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