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r in (-oo:+oo)
-63 = (9/2)*r // - (9/2)*r
-((9/2)*r)-63 = 0
(-9/2)*r-63 = 0
-9/2*r-63 = 0 // + 63
-9/2*r = 63 // : -9/2
r = 63/(-9/2)
r = -14
r = -14
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