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y in (-oo:+oo)
(3/2)*y = -27/4 // + -27/4
(3/2)*y-(-27/4) = 0
(3/2)*y+27/4 = 0
3/2*y+27/4 = 0 // - 27/4
3/2*y = -27/4 // : 3/2
y = -27/4/3/2
y = -9/2
y = -9/2
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