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y in (-oo:+oo)
(2/11)*y-9 = 12 // - 12
(2/11)*y-12-9 = 0
2/11*y-21 = 0 // + 21
2/11*y = 21 // : 2/11
y = 21/2/11
y = 231/2
y = 231/2
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