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y in (-oo:+oo)
(2/3)*(6*y-1)-(8*y) = (4/7)*(1-(7*y)) // - (4/7)*(1-(7*y))
(2/3)*(6*y-1)-((4/7)*(1-(7*y)))-(8*y) = 0
(2/3)*(6*y-1)+(-4/7)*(1-7*y)-8*y = 0
2/3*(6*y-1)-4/7*(1-7*y)-8*y = 0
2/3*(6*y-1)-4/7*(1-7*y)-8*y = 0
8*y-8*y-26/21 = 0
-26/21 = 0
-26/21 = 0
-26/21 = 0 // * 21
-26 = 0
-26 = 0
y belongs to the empty set
y belongs to the empty set
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