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y in (-oo:+oo)
(9/2)*y = 27/2 // - 27/2
(9/2)*y-(27/2) = 0
(9/2)*y-27/2 = 0
9/2*y-27/2 = 0 // + 27/2
9/2*y = 27/2 // : 9/2
y = 27/2/9/2
y = 3
y = 3
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