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w in (-oo:+oo)
(6*w-7)/5 = 7 // - 7
(6*w-7)/5-7 = 0
(6*w-7)/5+(-7*5)/5 = 0
6*w-7*5-7 = 0
6*w-42 = 0
(6*w-42)/5 = 0
(6*w-42)/5 = 0 // * 5
6*w-42 = 0
6*w-42 = 0 // + 42
6*w = 42 // : 6
w = 42/6
w = 7
w = 7
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