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w in (-oo:+oo)
57 = -w/7 // + -w/7
57-(-w/7) = 0
(1/7)*w+57 = 0
1/7*w+57 = 0 // - 57
1/7*w = -57 // : 1/7
w = -57/1/7
w = -399
w = -399
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