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y in (-oo:+oo)
(1/3)*(6*y-9) = 2*y+13 // - 2*y+13
(1/3)*(6*y-9)-(2*y)-13 = 0
(1/3)*(6*y-9)-2*y-13 = 0
1/3*(6*y-9)-2*y-13 = 0
1/3*(6*y-9)-2*y-13 = 0
-13-3 = 0
-16 = 0
-16 = 0
y belongs to the empty set
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