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y in (-oo:+oo)
6*7*(y+6/7) = 6*7*(y-(2/6)) // - 6*7*(y-(2/6))
6*7*(y+6/7)-(6*7*(y-(2/6))) = 0
6*7*(y+6/7)-42*(y-1/3) = 0
42*(y+6/7)-42*(y-1/3) = 0
42*(y+6/7)-42*(y-1/3) = 0
50 = 0
50 = 0
y belongs to the empty set
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