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w in (-oo:+oo)
(1/4)*w+7 = 315/44 // - 315/44
(1/4)*w-(315/44)+7 = 0
(1/4)*w-315/44+7 = 0
1/4*w-7/44 = 0 // + 7/44
1/4*w = 7/44 // : 1/4
w = 7/44/1/4
w = 7/11
w = 7/11
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