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w in (-oo:+oo)
(7/10)*w-18 = ((5/1)/5)*w // - ((5/1)/5)*w
(7/10)*w-(((5/1)/5)*w)-18 = 0
(7/10)*w-w-18 = 0
-3/10*w-18 = 0 // + 18
-3/10*w = 18 // : -3/10
w = 18/(-3/10)
w = -60
w = -60
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