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y in (-oo:+oo)
(9/4)*y = 27/4 // - 27/4
(9/4)*y-(27/4) = 0
(9/4)*y-27/4 = 0
9/4*y-27/4 = 0 // + 27/4
9/4*y = 27/4 // : 9/4
y = 27/4/9/4
y = 3
y = 3
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