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y in (-oo:+oo)
(2/3)*y-9 = 14 // - 14
(2/3)*y-14-9 = 0
2/3*y-23 = 0 // + 23
2/3*y = 23 // : 2/3
y = 23/2/3
y = 69/2
y = 69/2
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