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r in (-oo:+oo)
(-3/2)*r = -27/8 // + -27/8
(-3/2)*r-(-27/8) = 0
(-3/2)*r+27/8 = 0
27/8-3/2*r = 0 // - 27/8
-3/2*r = -27/8 // : -3/2
r = -27/8/(-3/2)
r = 9/4
r = 9/4
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