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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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