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y in (-oo:+oo)
(13*y)/14-3 = 6*((-7*y)/2) // - 6*((-7*y)/2)
(13*y)/14-(6*((-7*y)/2))-3 = 0
(13*y)/14+21*y-3 = 0
307/14*y-3 = 0 // + 3
307/14*y = 3 // : 307/14
y = 3/307/14
y = 42/307
y = 42/307
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