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w in (-oo:+oo)
(3/7)*w+10 = 61/7 // - 61/7
(3/7)*w-(61/7)+10 = 0
(3/7)*w-61/7+10 = 0
3/7*w+9/7 = 0 // - 9/7
3/7*w = -9/7 // : 3/7
w = -9/7/3/7
w = -3
w = -3
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