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y in (-oo:+oo)
(2*(3*y-12))/3 = 3*y-13 // - 3*y-13
(2*(3*y-12))/3-(3*y)+13 = 0
(2*(3*y-12))/3-3*y+13 = 0
(2*(3*y-12))/3+(-3*3*y)/3+(3*13)/3 = 0
2*(3*y-12)-3*3*y+3*13 = 0
39-3*y-24 = 0
15-3*y = 0
(15-3*y)/3 = 0
(15-3*y)/3 = 0 // * 3
15-3*y = 0
15-3*y = 0 // - 15
-3*y = -15 // : -3
y = -15/(-3)
y = 5
y = 5
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