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w in (-oo:+oo)
(3/7)*w+10 = 4*w+170/7 // - 4*w+170/7
(3/7)*w-(4*w)-(170/7)+10 = 0
(3/7)*w-4*w-170/7+10 = 0
-25/7*w-100/7 = 0 // + 100/7
-25/7*w = 100/7 // : -25/7
w = 100/7/(-25/7)
w = -4
w = -4
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