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w in (-oo:+oo)
(1/7)*w+4 = 31/8 // - 31/8
(1/7)*w-(31/8)+4 = 0
(1/7)*w-31/8+4 = 0
1/7*w+1/8 = 0 // - 1/8
1/7*w = -1/8 // : 1/7
w = -1/8/1/7
w = -7/8
w = -7/8
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