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w in (-oo:+oo)
(12/3)*w = 36/63 // - 36/63
(12/3)*w-(36/63) = 0
(12/3)*w-4/7 = 0
4*w-4/7 = 0 // + 4/7
4*w = 4/7 // : 4
w = 4/7/4
w = 1/7
w = 1/7
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