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