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y in (-oo:+oo)
9/2 = (-1/2)*y-(3/4) // - (-1/2)*y-(3/4)
9/2-((-1/2)*y)+3/4 = 0
(1/2)*y+9/2+3/4 = 0
1/2*y+21/4 = 0 // - 21/4
1/2*y = -21/4 // : 1/2
y = -21/4/1/2
y = -21/2
y = -21/2
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