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