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w in (-oo:+oo)
(10*w-10)/7 = 23 // - 23
(10*w-10)/7-23 = 0
(10*w-10)/7+(-23*7)/7 = 0
10*w-23*7-10 = 0
10*w-171 = 0
(10*w-171)/7 = 0
(10*w-171)/7 = 0 // * 7
10*w-171 = 0
10*w-171 = 0 // + 171
10*w = 171 // : 10
w = 171/10
w = 171/10
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