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y in (-oo:+oo)
(1/3)*(6*y-9) = 13-2*y // - 13-2*y
(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
4*y-13-3 = 0
4*y-16 = 0
4*y-16 = 0
4*y-16 = 0 // + 16
4*y = 16 // : 4
y = 16/4
y = 4
y = 4
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